WordReference Random House Unabridged Dictionary of American English © 2026
ex•o•pe•rid•i•um
(ek′sō pə rid′ē əm),USA pronunciation n., pl. -rid•i•a (-rid′ē ə).USA pronunciation [Mycol.]
- Fungithe outer of the two layers into which the peridium is divided.
- exo- + peridium