adj.of or pertaining to or characteristic of plants of the family Iridaceae
英汉双解大词典
iridaceous/ˌɪrɪˈdeɪʃəs, ˌaɪ-/
1.
ADJ（形容词）
of, relating to, or belonging to the Iridaceae, a family of monocotyledonous plants, including iris, crocus, and gladiolus, having swordlike leaves and showy flowers 鸢尾科的