I. ik-ˈstiŋ(k)t, ˈek-ˌ adjective
Etymology: Middle English, from Latin exstinctus, past participle of exstinguere
Date: 15th century
1.
a. : no longer burning
b. : no longer active
an extinct volcano
2. : no longer existing
an extinct animal
3.
a. : gone out of use : superseded
b. : having no qualified claimant
an extinct title
II. transitive verb
Date: 15th century
archaic : extinguish