The Collaborative International Dictionary
Hymenia
Hymenium \Hy*me"ni*um\, n.; pl. L. Hymenia, E. Hymeniums. [NL., fr. Gr. ? a membrane.] (Bot.) The spore-bearing surface of certain fungi, as that on the gills of a mushroom.
Wiktionary
hymenia
n. (plural of hymenium English)