Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Lacking a backbone or spinal column; not vertebrate.
  • adjective Of or relating to invertebrates.
  • noun An animal, such as an insect or mollusk, that lacks a backbone or spinal column.

from The Century Dictionary.

  • 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.
  • noun An invertebrated animal; any one of the Invertebrata.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective (Zoöl.) Destitute of a backbone; having no vertebræ; of or pertaining to the Invertebrata.
  • adjective See Age, and Silurian.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun An animal without vertebrae, i.e. backbone.
  • adjective Lacking a backbone.

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

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

Etymologies

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Examples

  • Nosema fungus that researchers had previously suspected, and a DNA-virus called invertebrate iridescent virus (IIV).

    Ars Technica Casey Johnston 2010

  • When the Army software, owned by DHS, was turned on the bee remains, it detected not only the fungus, but also a virus known as the invertebrate iridescent virus (IIV).

    TIME.com: Top Stories 2010

  • Nosema fungus that researchers had previously suspected, and a DNA-virus called invertebrate iridescent virus (IIV).

    Ars Technica Casey Johnston 2010

  • We'll leave it up to France's budding etymologist to decide whether his maneuvering should be labeled "invertebrate" or "spineless."

    Europe's Retreat 2008

  • To use Bruce Fein's word, let's don't be "invertebrate" about it.

    Republicans Lose When They Win 2007

  • Puget Sound is home to the world's largest octopus, the giant Pacific octopus, which is also the world's largest invertebrate, meaning it has no bones.

    Latest Articles 2009

  • Puget Sound is home to the world's largest octopus, the giant Pacific octopus, which is also the world's largest invertebrate, meaning it has no bones.

    Latest Articles 2009

  • Such ancient grassland might have 30 species of plant in a single square metre and innumerable invertebrate animals which have supported such remarkable birds as the stone curlew and many skylarks.

    Letters: Vanished landscape 2011

  • The endemic fauna includes 115 indigenous, 24 introduced vertebrate, and 2,000 invertebrate species.

    Galápagos National Park & Galápagos Marine Resources Reserve, Ecuador 2009

  • All these defences have kept this specimen completely untouched by summer's relentless vegetarian armies, invertebrate and mammalian, that might otherwise want to take the plant's nutrients.

    Country diary: Claxton, Norfolk 2011

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