Entry 1 sense Webster, 1913 Calceiform /(kăl"sē̇*ĭ*fôrm`)/ · Cal·ce·i·form · IPA /ˈkælsiːəfɔɹm/ 01 a. Shaped like a slipper, as one petal of the lady's-slipper; calceolate. 1. Shaped like a slipper, as one petal of the lady's-slipper; calceolate.(Bot.)