Apedia

Animal Invertebrate |ɪnˈvəːtɪbrət| Noun Lacking Backbone Arthropod Mollusc

Front invertebrate
|ɪnˈvəːtɪbrət|
Back noun
an animal lacking a backbone, such as an arthropod, mollusc, annelid, coelenterate, etc. The invertebrates constitute an artificial division of the animal kingdom, comprising 95 per cent of animal species and about thirty different phyla.
Compare with vertebrate.
adjective
denoting an invertebrate or relating to the invertebrates as a group.

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