Merriam-Webster's Collegiate® Dictionary, 11th Edition
EXTINCT
I. adjective
Etymology: Middle English, from Latin exstinctus, past participle of exstinguere
Date: 15th century
1. no longer burning, no longer active , no longer existing ,
3. gone out of use ; superseded, having no qualified claimant ,
II. transitive verb
Date: 15th century
extinguish