The Collaborative International Dictionary of English v.0.48:
Slipperwort \Slip"per*wort`\, n. (Bot.) See Calceolaria. [1913 Webster]WordNet (r) 3.0 (2006):
slipperwort n 1: any garden plant of the genus Calceolaria having flowers with large inflated slipper-shaped lower lip [syn: calceolaria, slipperwort]