Apedia

Animal Invertebrates Noun Lacking Backbone Arthropod Mollusc Annelid

Front
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.

Back invertebrate

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