Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.
Definition of Hemi
Medically reviewed by Min Clinic Staff | Updated: January 2026
Hemi-: Prefix meaning one half, as in hemiparesis, hemiplegia, and hemithorax. From the Greek hemisus meaning half and equivalent to the Latin semi-. As a general rule, not always followed, hemi- goes with words of Greek origin and semi- with those of Latin origin.