Webster’s Revised Unabridged Dictionary · 1913 Spearmint Spear′mint′ (·mĭnt′), n. [So named from its spiry, not capitate, inflorescence. Dr. Prior.] (Bot.) A species of mint (Mentha viridis) growing in moist soil. It vields an aromatic oil. See Mint, and Mentha. ‹ Spearman Spearwood ›