Dictionary![]() ![]() ex•tinctPronunciation: (ik-stingkt'), [key] —adj. 1. no longer in existence; that has ended or died out: an extinct species of fish. 2. no longer in use; obsolete: an extinct custom. 3. extinguished; quenched; not burning. 4. having ceased eruption; no longer active: an extinct volcano. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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