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MedTerms Medical Dictionary A-Z List - R: Detailed Datasheet
Medically reviewed by Min Clinic Staff | Updated: January 2026
Ra-RaRb-ReRf-RkRl-RoRp-Rz
RRa-Ra
- R (symbol)
- R-2
- r-tPA
- R/O
- RA
- Rabbit fever
- Rabies
- Raccoon roundworm infection
- Race
- Race-based drug
- Race-based medication
- Race-based therapy
- Racemose
- Racemose aneurysm
- Rad
- RAD51
- Radial
- Radial drusen
- Radial head dislocation
- Radial head subluxation
- Radial keratotomy
- Radiate
- Radiation
- Radiation during pregnancy
- Radiation fibrosis
- Radiation menopause
- Radiation oncologist
- Radiation oncology
- Radiation pneumonitis
- Radiation sickness
- Radiation therapy
- Radiation therapy, 3-D
- Radiation therapy, conformal
- Radiation therapy, conformational
- Radiation therapy, external
- Radiation therapy, internal
- Radiation therapy, stereotactic
- Radiation therapy, targeted
- Radiation toxicity
- Radiation, background
- Radiation, food
- Radiation, ultraviolet
- Radical dissection
- Radical neck
- Radical neck dissection
- Radical prostatectomy
- Radicular pain
- Radiculopathy
- Radiculopathy, lumbar
- Radio frequency identification
- Radioactive
- Radioactive iodine
- Radioactive tracer
- Radioallergosorbent test
- Radiofrequency ablation
- Radiograph
- Radiography
- Radioimmunoassay
- Radioinsensitive
- Radioiodine
- Radioisotope
- Radiologic
- Radiologist
- Radiology
- Radiology, interventional
- Radiolucent
- Radiomimetic
- Radionuclide
- Radionuclide scan
- Radionuclide stress test
- Radiopaque
- Radiosensitive
- Radiotherapy
- Radiotherapy, stereotactic
- Radium
- Radius
- Radon
- Raeder's syndrome
- Ragged red fibers with CPEO
- Ragweed
- Raised hemidiaphragm
- Rale
- Ramsay Hunt syndrome
- Ramus
- Ramus of the mandible
- Random
- Random mating
- Random number table
- Random numbers
- Random sample
- Randomization
- Randomize
- Randomized
- Randomized clinical trial
- Randomized controlled trial
- Randomly
- Range
- Range of motion
- Range, normal
- RANTES
- Rape
- Rape, date
- Rapid eye movement sleep
- Rapid plasma reagin test
- Rapid strep test
- Rapunzel syndrome
- Rash
- Rash, butterfly
- Rash, chickenpox
- Rash, varicella
- Rash, vesicular
- Rash, yeast diaper
- Rasmussen encephalitis
- Rasmussen syndrome
- RAST
- Rat, cotton
- Rat, rice
- Rat-flea typhus
- Rate, basal metabolic
- Rate, birth
- Rate, death
- Rate, erythrocyte sedimentation
- Rate, fetal mortality
- Rate, heart
- Rate, infant mortality
- Rate, maternal mortality
- Rate, mortality
- Rate, neonatal mortality
- Rate, pulse
- Rate, respiratory
- Rate, sed
- Rate, sedimentation
- Rattlesnake bite
- Raw egg
- Ray, Roentgen
- Raynaud's disease
- Raynaud's phenomenon
RRb-Re
- RBC
- RCT
- RDA
- RDIs (Reference Daily Intakes)
- RDS (respiratory distress syndrome)
- Re-uptake
- Reabsorption
- Reactant, acute phase
- Reactant, acute-phase
- Reaction kinetics
- Reaction, allergic
- Reaction, chemical
- Reaction, desmoplastic
- Reaction, hibernation
- Reaction, polymerase chain
- Reaction, vasovagal
- Reactive arthritis
- Reactive Attachment Disorder (RAD)
- Reactive oxygen species
- Reading frame
- Reading frame, open
- Reading retardation
- Reagent
- Reaven syndrome
- Rebound
- Rebound effect
- Recalcitrant
- Recalls, FDA
- Recent memory
- Receptor
- Receptor, chemokine
- Receptor, T-cell
- Receptor, visual
- Recession of Medial Rectus Muscle
- Recessive
- Recessive, autosomal
- Recessive, X-linked
- Recipient
- Reciprocal translocation
- Recombinant
- Recombinant clones
- Recombinant DNA Advisory Committee (RAC)
- Recombinant DNA molecules
- Recombinant DNA technology
- Recombinant tPA
- Recombination
- RECOMBIVAX-HB
- Recommended Daily Allowance
- Recommended Dietary Allowance
- Recreational water illness
- Recrudescence
- Rectal (adjective)
- Rectal (noun)
- Rectal bleeding
- Rectal cancer
- Rectal exam, digital (DRE)
- Rectal incontinence
- Rectal itching
- Rectocele
- Rectouterine pouch
- Rectum
- Rectus
- Rectus abdominis
- Recuperate
- Recur
- Recurrence
- Recurrence risk
- Recurrent
- Recurrent abortion
- Recurrent aural vertigo
- Recurrent laryngeal nerve
- Recurrent respiratory papillomatosis
- Recurrent trisomy
- Red blood cell
- Red blood cells
- Red cell count
- Red cell distribution width
- Red cells
- Red corpuscles
- Red Devils
- Red ear syndrome
- Red eye
- Red jungle fowl
- Red jungle fowl genome
- Red Raspberry (Raspberry ketone)
- Red yeast rice
- Red-green colorblindness
- Reduction division
- Reduction mammaplasty
- Reduction, breast
- Reduviid bug
- Reed-Sternberg cell
- Referral
- Referred pain
- Reflex
- Reflex sympathetic dystrophy (RSD)
- Reflex sympathetic dystrophy syndrome (RSDS)
- Reflex, Babinski
- Reflex, let down
- Reflex, patellar
- Reflex, patellar tendon
- Reflex, photic sneeze
- Reflex, pressor
- Reflex, quadriceps
- Reflux
- Reflux disease, gastroesophageal (GERD)
- Reflux laryngitis
- Reflux surgery (fundoplication)
- Reflux, esophageal
- Refract
- Refraction
- Refraction test
- Refractive Lens Exchange
- Refractory
- Refractory anemia
- Refractory epilepsy
- Refsum disease
- Regenerate
- Regimen
- Region, regulatory
- Regional enteritis
- Regional lymphadenitis
- Registry
- Registry, tumor
- Regress
- Regulatory gene
- Regulatory region
- Regulatory sequence
- Regulatory T cell
- Regurgitation
- Regurgitation, aortic
- Regurgitation, mitral
- Rehab
- Rehabilitation
- Rehydrate
- Rehydration
- Reiki
- Reimplantation
- Reinnervate
- Reinnervation
- Reinstein syndrome
- Reiter syndrome
- Rejection
- Relapse
- Relapsing fever
- Relaxant
- Relaxin
- Release, carpal tunnel
- Rem
- REM sleep
- Remedy
- Remission
- Remission induction chemotherapy
- Remodeling, chromatin
- Remodelling, chromatin
- Remote telesurgery
- Renal
- Renal aneurysm
- Renal artery stenosis
- Renal calculi
- Renal cancer
- Renal capsule
- Renal cell cancer
- Renal cell carcinoma
- Renal Fanconi syndrome
- Renal infection in children
- Renal osteodystrophy
- Renal pelvis
- Renal stone
- Renal syndrome with hemorrhagic fever
- Renal transplant
- Renal tubules
- Renal vein thrombosis
- Rendu-Osler-Weber syndrome
- rep
- Repair, DNA
- Repair, hernia
- Repair, mismatch
- Repeat
- Reperfusion
- Repetitive DNA
- Repetitive stress injury
- Replacement therapy, estrogen (ERT)
- Replacement therapy, hormone (HRT, HT)
- Replacement therapy, testosterone
- Replacement, total hip
- Replantation
- Replication
- Replication, DNA
- Reportable disease
- Reporting, anonymous
- Reporting, named
- Reporting, unique identifier
- Representational oligonucleotide microarray
- Reproduction
- Reproductive cells
- Reproductive organs, female
- Reproductive system
- Research, clinical
- Research, controlled
- Resect
- Resectable
- Resection
- Resection, video-assisted
- Reservoir
- Reservoir of infection
- Reservoir, Ommaya
- Resident
- Residual
- Resignation syndrome
- Resin, bile acid
- Resistance
- Resistance, antibiotic
- Resistance, aspirin
- Resistance, insulin
- Resistance, pulmonary
- Resistance, vascular
- Resolution
- Resorb
- Resorption
- Respiration
- Respiratory
- Respiratory depression
- Respiratory disease, acute
- Respiratory distress syndrome (RDS)
- Respiratory distress syndrome, acute
- Respiratory failure
- Respiratory insufficiency
- Respiratory papillomatosis, recurrent
- Respiratory rate
- Respiratory syncytial virus
- Respiratory system
- Respiratory therapist
- Respiratory therapy
- Response, Babinski
- Response, hyperglycemic
- Response, plantar
- Rest
- Restenosis
- Resting phase
- Restitution
- Restless Anal Syndrome
- Restless leg syndrome
- Restless legs
- Restriction endonuclease
- Restriction enzyme
- Restriction fragment length polymorphism
- Restriction map
- Restriction site
- Resuscitate
- Resuscitation
- Resveratrol
- Retardation, reading
- Retic
- Retic count
- Reticulocyte
- Reticulocyte count
- Reticulocytosis
- Reticuloendotheliosis, leukemic
- Retina
- Retina, detached
- Retinal
- Retinal artery, central
- Retinal detachment
- Retinal disease
- Retinal electrophysiologic testing
- Retinal fundus
- Retinal pigment epithelium
- Retinal vasculitis
- Retinal vein, central
- Retinal wrinkling
- Retinitis pigmentosa
- Retinitis pigmentosa and congenital deafness
- Retinoblastoma
- Retinoic acid syndrome
- Retinoid
- Retinol
- Retinopathy
- Retinopathy, arteriosclerotic
- Retinopathy, diabetic
- Retinoschisis
- Retinoschisis, juvenile
- Retinoschisis, X-linked
- Retinoschisis, X-linked juvenile
- Retraction syndrome
- Retrodiagnosis
- Retrograde amnesia
- Retrograde intrarenal surgery (RIRS)
- Retromingent
- Retroposition
- Retropubic prostatectomy
- Retrospective
- Retrospective diagnosis
- Retrospective study
- Retrosternal
- Retrovirus
- Rett syndrome
- Reuptake
- Reversal of organs, total
- Reverse genetics
- Reverse transcriptase
- Reverse transcriptase-polymerase chain reaction
- Reye syndrome
RRf-Rk
- RF
- RFA
- RFID
- RFLP
- Rh factor
- Rh incompatibility
- Rhabdomyolysis
- Rhabdomyosarcoma
- Rheumatic fever
- Rheumatic heart disease
- Rheumatism
- Rheumatism, generalized
- Rheumatism, localized
- Rheumatism, psychogenic
- Rheumatoid arthritis
- Rheumatoid arthritis, systemic-onset juvenile
- Rheumatoid factor
- Rheumatoid nodules
- Rheumatoid spondylitis
- Rheumatologist
- Rheumatologist, pediatric
- Rheumatology
- Rhinitis
- Rhinitis Acute
- Rhinitis Chronic
- Rhinitis, allergic
- Rhinitis, allergic, perennial
- Rhinitis, allergic, seasonal
- Rhinitis, vasomotor
- Rhinophyma
- Rhinoplasty
- Rhinorrhea
- Rhinotillexomania
- Rhinovirus
- Rhizomelic chondrodysplasia punctata
- Rhogam
- Rhythm method
- Rhythm, sinus
- Rib
- Rib cage
- Rib, cervical
- Rib, false
- Rib, floating
- Rib, fluctuating
- Rib, sternal
- Rib, true
- Rib, vertebral
- Ribonucleic acid (RNA)
- Ribonucleoprotein (RNP)
- Ribosomal RNA
- Ribosome
- Ribozyme
- Rice rat
- Richard L. Varco
- Ricin
- Ricker syndrome
- Rickets
- Rickets, celiac
- Rickets, hypophosphatemic
- Rickets, renal
- Rickets, vitamin D resistant
- Ricketts, Howard T.
- Rickettsia
- Rickettsial diseases
- Rickettsialpox
- Rickettsioses
- Rickettsioses of the eastern hemisphere, tick-born
- Rickettsiosis, North Asian tick-borne
- Rickettsiosis, vesicular
- Rift Valley fever
- Right atrium
- Right heart
- Right hepatic duct
- Right ventricle
- Right-handed
- Rigor
- Rigor mortis
- Rigour (Rigor)
- Riley-Day syndrome
- Ring avulsion injury
- Ring chromosome
- Ring vaccination
- Ring, intrastromal corneal
- Ringing in the ears
- Ringworm (tinea)
- Ringworm of the nails
- Riot control agent poisoning
- RIRS (retrograde intrarenal surgery)
- Risk factor
- Risk of recurrence
- Ritter disease
- River blindness
RRl-Ro
- RLL
- RLQ
- RML
- RMSF
- RNA
- RNA editing
- RNA interference
- RNA polymerase
- RNA silencing
- RNA virus
- RNA virus, negative-strand
- RNA virus, positive-strand
- RNA, messenger
- RNA, ribosomal
- RNA, transfer
- RNAi
- Roach-2
- Roapies
- Robertsonian translocation
- Robo
- Robotripping
- Robust
- Rochalimaea quintana
- Rock (drug)
- Rocky Mountain spotted fever (RMSF)
- Rocky Mountain wood tick
- Rod
- Rod Beals
- Rodbell
- Rodbell, Martin
- Rodenticidal
- Rodenticide
- Rodney K. Beals
- Roentgen
- Roentgen ray
- Roentgen, Wilhelm
- Roentgenology
- Rohypnol
- ROMA
- Romano-Ward syndrome
- Roofer's knee
- Roofies
- Rooting reflex
- Rorschach test
- Rosacea
- Rosacea keratitis
- Rosary pea
- Roseola
- Roseola infantilis
- Roseola infantum
- Rossi counter
- Rotator cuff
- Rotator cuff disease
- Rotavirus
- Roth's spot
- Rothmund-Thomson syndrome
- Round
- Round window
- Rounds
- Roundworm
- Roundworm C. elegans genome
- Roundworm genome
- Roux-en-Y gastric bypass
- Royal Society, the
RRp-Rz
- RP
- RPR test
- rRNA
- RS1
- RSV
- RT
- RT-PCR
- RTS
- RTT (Rett syndrome)
- RU-486
- Rubella immunization
- Rubella syndrome
- Rubella vaccine
- Rubeola (measles)
- Rubor
- RUL
- Rule out
- Rumination
- Runny nose
- Runt-related transcription factor 1
- Runx-1
- Rupture
- Rupture of appendix
- Rupture, uterine
- Ruptured spleen
- RUQ
- RV (rotavirus)
- RVF
- RWI
- Rx