英语词源字典 - 在线词源网站

iridaceous [iridaceous 词源字典]: "Relating to or denoting plants of the iris family (Iridaceae), which grow from bulbs, corms, or rhizomes", Mid 19th century: from modern Latin Iridaceae (plural), based on Greek iris, irid- 'rainbow', + -ous.[iridaceous etymology, iridaceous origin, 英语词源]
cocoyam: "(In West Africa) either of two plants of the arum family with edible corms, i.e. taro (also old cocoyam) and tannia (also new cocoyam)", Early 20th century: probably from coco (sense 2) + yam.