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 Substance

Medically reviewed by Dr. Otari Nergadze, Neurosurgeon | Updated: January 2026

Substance: 1. Material with particular features.
2. The material that makes up an organ or structure. Also known in medicine as the substantia.

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