Synonyms of extinct
1
a
: no longer burning
an extinct fire
an extinct hope
b
: no longer active
an extinct volcano
2
: no longer existing
an extinct animal
3
a
: gone out of use : superseded
extinct customs
b
: having no qualified claimant
an extinct title

extinct

2 of 2

verb

extincted; extincting; extincts

Examples of extinct in a Sentence

Adjective Many of these old traditions have since become extinct. a few overgrown ruins are all that remain of that once mighty but now extinct civilization
Recent Examples on the Web
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Adjective
Food production will drop, people will go hungry, water shortages will worsen, economies will be hurt and species like coral will go extinct, the report said. ABC News, 2 Sep. 2026 Conservation efforts began in 1894, but the species nearly went extinct by the mid‑1900s. Adela Suliman, NBC news, 1 Sep. 2026 Some smokejumpers believe that they are being sent to fewer fires than before, and fear that their profession could go extinct. M. R. O’Connor, New Yorker, 31 Aug. 2026 Scientists found evidence years ago that our species, Homo sapiens, had interbred with now-extinct human relatives, including Neanderthals and Denisovans. Taylor Nicioli, CNN Money, 26 Aug. 2026 See All Example Sentences for extinct

Word History

Etymology

Adjective

Middle English, from Latin exstinctus, past participle of exstinguere

First Known Use

Adjective

15th century, in the meaning defined at sense 1a

Verb

15th century, in the meaning defined above

Time Traveler
The first known use of extinct was in the 15th century

Browse Nearby Words

Cite this Entry

“Extinct.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/extinct. Accessed 4 Sep. 2026.

Kids Definition

extinct

adjective
ex·​tinct
ik-ˈstiŋ(k)t
ˈek-ˌ
1
: no longer active
an extinct volcano
2
: no longer existing
an extinct species of animal

Medical Definition

: no longer existing : lacking living representatives
extinct prehistoric animals
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