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| phylum of worms comprised of parasitic and free-living nonparasitic species |
| animal phylum comprised of sponges |
| endoskeleton (ˌɛndəʊˈskɛlɪtən) | |
| —n | |
| Compare exoskeleton the internal skeleton of an animal, esp the bony or cartilaginous skeleton of vertebrates | |
| endo'skeletal | |
| —adj | |
endoskeleton en·do·skel·e·ton (ěn'dō-skěl'ĭ-tn)
n.
An internal supporting skeleton, derived from the mesoderm, that is characteristic of vertebrates and certain invertebrates.
| endoskeleton (ěn'dō-skěl'ĭ-tn) Pronunciation Key
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. |