Definitions of butterfly orchid:

noun: Mediterranean orchid having usually purple flowers with a fan-shaped spotted or striped rose-red lip
noun: orchid of Florida and the Bahamas having showy brightly colored flowers; sometimes placed in genus Epidendrum
noun: Mexican epiphytic orchid having pale green or yellow-green flowers with white purple-veined lip
noun: any orchid of the genus Psychopsis: spectacular large tiger-striped orchids
noun: any orchid of the genus Oncidium: characterized by slender branching sprays of small yellow and brown flowers; often grown as houseplants