extinct

Something that no longer exists and has no living representative is extinct. Dinosaurs are extinct. Polar bears may become extinct. Sadly, history teachers who force their students to memorize long lists of dates are in no danger of becoming extinct.

You often hear of a species being extinct: there are no living representatives of the species left. But extinct also describes something that has gone out or grown cold, as in a dormant volcano "extinct volcano" or a tobacco pipe whose flame has died out "extinct pipe." That’s because extinct comes from the Latin extinguere/exstinguere for "extinguish." Originally extinct referred to fires that died out (were extinguished). Its meaning grew to encompass a family line and then a species.

Definitions of extinct
1

adj no longer in existence; lost or especially having died out leaving no living representatives

“an extinct species of fish”
“an extinct royal family”
extinct laws and customs”
Synonyms:
nonextant
nonexistent
not having existence or being or actuality
dead
not surviving in active use
Antonyms:
extant
still in existence; not extinct or destroyed or lost
existent, existing
having existence or being or actuality
living
still in active use
living, surviving
still in existence
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adj (of e.g. volcanos) permanently inactive

“an extinct volcano”
Synonyms:
dead
physically inactive
Antonyms:
active
(of e.g. volcanos) capable of erupting
alive, live
capable of erupting
live
exerting force or containing energy
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adj being out or having grown cold

“threw his extinct cigarette into the stream”
Synonyms:
out
dead
not showing characteristics of life especially the capacity to sustain life; no longer exerting force or having energy or heat

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