extinct (adj.)

early 15c., "extinguished, quenched," from Latin extinctus/exstinctus, past participle of extinguere/exstinguere "to put out, quench; go out, die out; kill, destroy" (see extinguish). Originally of fires; in reference to the condition of a family or a hereditary title that has "died out," from 1580s; of species by 1690s. Shakespeare uses it as a verb. Compare extinction.

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Definitions of extinct from WordNet

extinct (adj.)
being out or having grown cold;
threw his extinct cigarette into the stream
Synonyms: out
extinct (adj.)
no longer in existence; lost or especially having died out leaving no living representatives;
an extinct royal family
extinct laws and customs
an extinct species of fish
Synonyms: nonextant
extinct (adj.)
(of e.g. volcanos) permanently inactive;
an extinct volcano