Oncidium \On*cid"i*um\, n. [NL.] (Bot.) A genus of tropical orchidaceous plants, the flower of one species of which ({O. Papilio}) resembles a butterfly.
oncidium n : any orchid of the genus Oncidium: characterized by slender branching sprays of small yellow and brown flowers; often grown as houseplants [syn: {dancing lady orchid}, {butterfly plant}, {butterfly orchid}]