[ ik-stingkt ]
/ ɪkˈstɪŋkt /


no longer in existence; that has ended or died out: an extinct species of fish.
no longer in use; obsolete: an extinct custom.
extinguished; quenched; not burning.
having ceased eruption; no longer active: an extinct volcano.

Origin of extinct

1400–50; late Middle English < Latin ex(s)tinctus put out, quenched, past participle of ex(s)tinguere to extinguish

Related forms

non·ex·tinct, adjectiveun·ex·tinct, adjective

Can be confused

extinct rare scarce

Synonym study

1. See dead.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for extinct

British Dictionary definitions for extinct


/ (ɪkˈstɪŋkt) /


(of an animal or plant species) having no living representative; having died out
quenched or extinguished
(of a volcano) no longer liable to erupt; inactive
void or obsoletean extinct political office

Word Origin for extinct

C15: from Latin exstinctus quenched, from exstinguere to extinguish
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Science definitions for extinct


[ ĭk-stĭngkt ]

Having no living members. Species become extinct for many reasons, including climate change, disease, destruction of habitat, local or worldwide natural disasters, and development into new species (speciation). The great majority of species that have ever lived-probably more than 99 percent-are now extinct.
No longer active or burning, as an extinct volcano.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.