from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An internal supporting skeleton, derived from the mesoderm, that is characteristic of vertebrates and certain invertebrates.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The internal skeleton of an animal, which in vertebrates is comprised of bone and cartilage.

from the GNU version of the Collaborative International Dictionary of English

  • n. The bony, cartilaginous, or other internal framework of an animal, as distinguished from the exoskeleton.

from The Century Dictionary and Cyclopedia

  • n. In anatomy, the internal skeleton or framework of the body; the whole bony, chitinous, cartilaginous, or other hard structure which lies within the integument, and is covered by flesh and skin, as distinguished from the exoskeleton.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the internal skeleton; bony and cartilaginous structure (especially of vertebrates)


From endo- +‎ skeleton. (Wiktionary)



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