extinct

Etymology 1

From Middle English extinct, from Latin extīnctus, the past participle of extinguere (“to put out, destroy, abolish, extinguish”), corresponding to ex- + stinguere (“to quench”). Replaced native Middle English aqueint, aquenched (“extinguished, extinct”).

adj

1. (dated) Extinguished, no longer alight (of fire, candles etc.)
   Poor Edward's cigarillo was already extinct.
2. No longer used; obsolete, discontinued.
   The title became extinct when the last baron died.
   Luckily, such ideas about race are extinct in current sociological theory.
   The ex-G.C. Class A5 4-6-2T, of which No. 69820 was one, is now extinct. 1961 January, Trains Illustrated, page 59, photo caption
   Indeed the very fact that the English spelling system writes in there as two words but therein as one word might be taken as suggesting that only the former is a productive syntactic construction in Modern English, the latter being a now extinct construction which has left behind a few fossil remnants in the form of compound words such as thereby. 1988, Andrew Radford, chapter 5, in Transformational grammar: a first course, Cambridge, UK: Cambridge University Press, page 275
3. (of a group of organisms, as a species) No longer in existence; having died out.
   The dinosaurs have been extinct for millions of years.
   Wrex: And before you die, I want you to know I'm calling off our support for Earth! If my people go extinct, so do yours! 2012, BioWare, Mass Effect 3 (Science Fiction), Redwood City: Electronic Arts, →OCLC, PC, scene: Citadel
4. (geology) No longer active.
   Most of the volcanos on this island are now extinct.
   They found the sites of extinct geysers.

Etymology 2

From Middle English extincten, from the adjective (see above).

verb

1. (transitive) To make extinct; to extinguish or annihilate.
   Paleontologists determine which animal species were extincted, and geomorphologists can find cycles of soil erosion. 2013, Steven A. LeBlanc, Katherine E. Register, Constant Battles: The Myth of the Peaceful, Noble Savage, St. Martin's Press