WordReference Random House Unabridged Dictionary of American English © 2026
ae•cid•i•um
(ē sid′ē əm),USA pronunciation n., pl. ae•cid•i•a (ē sid′ē ə).USA pronunciation [Mycol.]
- Fungian aecium in which the spores are always formed in chains and enclosed in a cup-shaped peridium.
- Neo-Latin; see aecium, -idium
- 1865–70