Having the shape or form of a slipper, shoe, or heel; slipper-shaped.
From Latin 'calceus' (shoe) combined with '-form' (shape), following the productive Latin-English pattern for describing morphological features.
This is the anatomist's favorite adjective—flowers like Paphiopedilum orchids are 'calceiform' because their lips look like tiny velvet slippers that literally trap insects inside!
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