Etymology
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invertebrate (adj.)

"having naturally no backbone," 1819, from Latin in- "not" (see in- (1)) + vertebratus (Pliny), from vertebra "joint or articulation of the body, joint of the spine" (see vertebra). As a noun, "an invertebrate animal," 1826.

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Definitions of invertebrate
1
invertebrate (n.)
any animal lacking a backbone or notochord; the term is not used as a scientific classification;
2
invertebrate (adj.)
lacking a backbone or spinal column;
worms are an example of invertebrate animals
Synonyms: spineless
From wordnet.princeton.edu