The Collaborative International Dictionary of English v.0.48:
Opuntiales \Opuntiales\ prop. n. An order of plants coextensive with the family Cactaceae, comprising the cactuses. Syn: order Opuntiales. [WordNet 1.5]WordNet (r) 3.0 (2006):
Opuntiales n 1: coextensive with the family Cactaceae: cactuses [syn: Opuntiales, order Opuntiales]