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Invertebrate


/inˈvərtəbrit/  /-ˌbrāt/

Noun, pl. invertebrates

1. An animal lacking a backbone, such as an arthropod, mollusk, annelid, coelenterate, etc. The invertebrates constitute an artificial division of the animal kingdom, comprising 95 percent of animal species and about 30 different phyla. (wiktionary.org)

2. Animal species that do not develop a vertebral column. This in effect includes all animals apart from the subphylum Vertebrata. (wikipedia.org)

3. An animal lacking a backbone, such as an arthropod, mollusk, annelid, coelenterate, etc. The invertebrates constitute an artificial division of the animal kingdom, comprising 95 percent of animal species and about 30 different phyla. (Google Dictionary)

4. Any animal lacking a backbone or notochord; the term is not used as a scientific classification. (wordnetweb.princeton.edu)

Adjective

1. Of, relating to, or belonging to this division of animals. (wiktionary.org)

2. Irresolute; spineless. (wiktionary.org)

3. Lacking a backbone or spinal column. (wordnetweb.princeton.edu)

Word origin: From Latin in– “not” + vertebra “joint”


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