from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Lacking a backbone or spinal column; not vertebrate.
  • adj. Of or relating to invertebrates: invertebrate zoology.
  • n. An animal, such as an insect or mollusk, that lacks a backbone or spinal column.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An animal without vertebrae, i.e. backbone.
  • adj. Lacking a backbone.

from the GNU version of the Collaborative International Dictionary of English

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

from The Century Dictionary and Cyclopedia

  • Not vertebrate; having no backbone; specifically, of or pertaining to the Invertebrata. Also invertebral, invertebrated.
  • Figuratively, flaccid, as if from lack of a backbone; wanting strength, firmness, or consistency; weak; nerveless.
  • n. An invertebrated animal; any one of the Invertebrata.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. any animal lacking a backbone or notochord; the term is not used as a scientific classification
  • adj. lacking a backbone or spinal column


Sorry, no etymologies found.


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