Source : Webster's Revised Unabridged Dictionary (1913)

Calceiform \Cal"ce*i*form`\ (k[a^]l"s[-e]*[i^]*f[^o]rm`), a. [L.
   calceus shoe + -form.] (Bot.)
   Shaped like a slipper, as one petal of the lady's-slipper;
   calceolate.

Source : WordNet®

calceiform
     adj : slipper-shaped; "the calceiform lip of certain orchids"
           [syn: {calceolate}]