dioscoreáceo , a . ( Of Dioscórides , famous Greek physician). 1. adj. Bot. Says of the Angiosperms, Monocots, herbaceous plants with fickle stems, often with tuberous roots or rhizomes, leaves opposite or alternate, heart-shaped, flowers actinomorphic, often Unisexual, in raceme or spike, and fruit in capsule or Berry; e.g., Yam. U t. c. s. f. 2. f. pl. Bot. These plant family. O RTOGR. ESCR. with may. initial.