The Collaborative International Dictionary
Iridaceous
Iridaceous \Ir`i*da"ceous\, Irideous \I*rid"e*ous\, a. [From NL. Iris, Iridis, the Iris.] (Bot.) Pertaining to, or resembling, a large natural order of endogenous plants ( Iridace[ae]), which includes the genera Iris, Ixia, Crocus, Gladiolus, and many others.
Wiktionary
iridaceous
a. (context botany English) Of or pertaining to the irises (of family ''Iridaceae'')
WordNet
iridaceous
adj. of or pertaining to or characteristic of plants of the family Iridaceae