stru·ma 
(strmə)
(strmə)n. pl. stru·mae (-mē) or stru·mas
1.
a. See scrofula.
b. See goiter.
2. Botany A cushionlike swelling at the base of a moss capsule.
[Latin strūma, scrofulous tumor.]
stru·matic (-mătĭk), strumose′ (-mōs′), strumous (-məs) adj.