Ungual

An ungual (from Latin unguis, i.e. nail) is a highly modified distal toe bone which ends in a hoof, claw, or nail. Elephants and ungulates have ungual phalanges, as did the sauropods and horned dinosaurs. A claw is a highly modified ungual phalanx.

An ungual of the ground sloth Eremotherium

As an adjective, ungual means related to nail, as in periungual (around the nail).[1]

References
  1. medical-dictionary.thefreedictionary.com


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