as·cid·i·um  (ə-sĭd'ē-əm)  n. pl. as·cid·i·a (ə-sĭd'ē-ə) Botany A pitcher-shaped or bottle-shaped part or organ, such as the hollow tubular leaf of a pitcher plant. [New Latin, from Greek askidion, diminutive of askos, wineskin.] as·cid'i·ate' adj., as·cid'i·form' (-ə-fôrm') adj. |