What is destitute of a backbone; having no vertebræ; of or pertaining to the Invertebrata. -- n. One of the Invertebrata. Age of invertebrates. See Age, and Silurian called?

invertebrate — Destitute of a backbone; having no vertebræ; of or pertaining to the Invertebrata. -- n. One of the Invertebrata. Age of invertebrates. See Age, and Silurian. (Webster's 1913.)

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