Part of speech: adjective

Destitute of a backbone.

Part of speech: noun

An invertebrate animal.

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Usage examples "invertebrate":

  1. Criticism she made in plenty, being the daughter of a voluble mother; and she never gave up hope of stiffening the spine of the invertebrate Hermie. - "Gigolo", Edna Ferber.
  2. One fellow, who reeled through the car in a molluscous invertebrate condition, stopped by my seat to tell me he was my friend for life. - "Seeds of Pine", Janey Canuck.
  3. But in that room, in that presence, I was invertebrate. - "The Beetle A Mystery", Richard Marsh.