a. | 1. | (Zool.) Destitute of a backbone; having no vertebræ; of or pertaining to the Invertebrata.
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Noun | 1. | invertebrate - any animal lacking a backbone or notochord; the term is not used as a scientific classification |
Adj. | 1. | invertebrate - lacking a backbone or spinal column; "worms are an example of invertebrate animals" Antonyms: vertebrate - having a backbone or spinal column; "fishes and amphibians and reptiles and birds and mammals are verbetrate animals" |