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.

Source: Webster's Revised Unabridged Dictionary (1913)