calceiform

from WordNet (r) 3.0 (2006)

calceiform
    adj 1: of slipper-shaped blossoms; "the calceiform lip of
           certain orchids" [syn: {calceolate}, {calceiform}]

from The Collaborative International Dictionary of English v.0.48

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.
   [1913 Webster]