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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. adj. No longer existing or living: an extinct species.
  2. adj. No longer burning or active: an extinct volcano.
  3. adj. No longer in use: an extinct custom. See Synonyms at dead.
  4. adj. Law Lacking a claimant; void: an extinct title.

Century Dictionary and Cyclopedia

  1. Extinguished; put out; quenched.
  2. Having ceased; being at an end; out of existence or out of force; terminated: as, an extinct family or race; an extinct law.
  3. n. Extinction.
  4. To put out; destroy.

Wiktionary

  1. adj. Extinguished, no longer alight (of fire, candles etc.)
  2. adj. No longer used; obsolete, discontinued.
  3. adj. No longer in existence; having died out.
  4. adj. No longer actively erupting.

GNU Webster's 1913

  1. adj. Extinguished; put out; quenched.
  2. adj. Without a survivor; without force; dead.
  3. adj. Once existing as a species but now having no living members; -- used of species of living organisms, especially of animals and plants.
  4. v. To cause to be extinct.

WordNet 3.0

  1. adj. being out or having grown cold
  2. adj. no longer in existence; lost or especially having died out leaving no living representatives
  3. adj. (of e.g. volcanos) permanently inactive

Etymologies

  1. Middle English, from Latin exstīnctus, past participle of exstinguere, to extinguish; see extinguish.

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‘extinct’ has been looked up 1715 times, added to 10 lists, and has a Scrabble score of 16.