invertebrate

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun any animal lacking a backbone or notochord; the term is not used as a scientific classification
adjective lacking a backbone or spinal column

From in- + vertebrate.

She's too invertebrate; but I believe she took care of Pogson all right." — The best British short stories of 1922, Unknown
The leathery, undeteriorative, and almost indestructible quality was an inherent attribute of the thing's form of organization, and pertained to some paleocene cycle of invertebrate evolution utterly beyond our powers of speculation. — At the mountains of madness, H. P. (Howard Phillips) Lovecraft

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