from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A hard outer structure, such as the shell of an insect or crustacean, that provides protection or support for an organism.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A hard outer structure that provides both structure and protection to creatures such as insects and Crustacea.
from the GNU version of the Collaborative International Dictionary of English
- n. 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.
from The Century Dictionary and Cyclopedia
- n. In zoology and anatomy, any structure produced by the hardening of the integument, as the shells of crustaceans or the scales and plates of fishes and reptiles, especially when such modified integument is of the nature of bone, as the carapace of a turtle or the plates of a sturgeon; the dermoskeleton: opposed to endoskeleton.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the exterior protective or supporting structure or shell of many animals (especially invertebrates) including bony or horny parts such as nails or scales or hoofs
From exo- + skeleton. (Wiktionary)