Meaning

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

adjective (of e.g. volcanos) permanently inactive

adjective being out or having grown cold

originFrom Late Middle English extinct (“eliminated, eradicated, extinguished”), from Latin extīnctus, exstīnctus (“extinguished, quenched; destroyed, killed; made extinct”), the perfect passive participles of extinguō, exstinguō (“to extinguish, put out, quench; (figurative) to abolish; to destroy, kill”), from ex- (prefix meaning ‘away; out’) + stinguō (“to extinguish, put out, quench”) (from…

Etymology from Wiktionary, CC BY-SA 3.0