Webster 1913 Edition
The hardened parts of the external integument of an animal, including hair, feathers, nails, horns, scales, etc.,as well as the armor of armadillos and many reptiles, and the shells or hardened integument of numerous invertebrates; external skeleton; dermoskeleton.
exoskeleton (plural exoskeletons)
- (anatomy) A hard outer structure that provides both structure and protection to creatures such as insects and Crustacea.
hard outer structure