Merriam-Webster Online Dictionary

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2 entries found for extinct.
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Main Entry: 1ex·tinct
Pronunciation: ik-'sti[ng](k)t, 'ek-"
Function: adjective
Etymology: Middle English, from Latin exstinctus, past participle of exstinguere
Date: 15th century
1 a : no longer burning b : no longer active <an extinct volcano>
2 : no longer existing <an extinct animal>
3 a : gone out of use : SUPERSEDED b : having no qualified claimant <an extinct title>