Entry 1 sense Webster, 1913

Invertebrate

/ĭnˌ-vẽrt'-əb-rət/ · In·ver·te·brate · IPA /ɪnˈvəːtɪbrət/

01 a. Destitute of a backbone; having no vertebræ; of or pertaining to the Invertebrata.

1.
Destitute of a backbone; having no vertebræ; of or pertaining to the Invertebrata.(Zool.)

Phrases & compounds

Age of invertebrates — See Age, and Silurian.