[en-doh-skel-i-tn] /ˌɛn doʊˈskɛl ɪ tn/

noun, Zoology.
the internal or framework of the body of an animal (opposed to ).
the internal skeleton of an animal, esp the bony or cartilaginous skeleton of vertebrates Compare exoskeleton

1838, from endo- + skeleton.

endoskeleton en·do·skel·e·ton (ěn’dō-skěl’ĭ-tn)
An internal supporting skeleton, derived from the mesoderm, that is characteristic of vertebrates and certain invertebrates.
en’do·skel’e·tal (-ĭ-tl) adj.
The internal supporting framework of humans and other vertebrates, usually made of bone. Certain invertebrates, such as sponges and echinoderms, also have endoskeletons. Compare exoskeleton.

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