UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ɪkˈstɪŋkt/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ɪkˈstɪŋkt/ ,USA pronunciation: respelling(ik stingkt)

WordReference Random House Learner's Dictionary of American English © 2020
ex•tinct /ɪkˈstɪŋkt/USA pronunciation   adj. 
  1. Biologyno longer in existence: an extinct species.
  2. no longer in use; obsolete: an extinct custom.
  3. no longer active: an extinct volcano.
ex•tinc•tion /ɪkˈstɪŋkʃən/USA pronunciation  n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2020
ex•tinct  (ik stingkt),USA pronunciation adj. 
  1. Biologyno longer in existence;
    that has ended or died out:an extinct species of fish.
  2. no longer in use;
    obsolete:an extinct custom.
  3. extinguished;
    not burning.
  4. having ceased eruption;
    no longer active:an extinct volcano.
  • Latin ex(s)tinctus put out, quenched, past participle of ex(s)tinguere to extinguish
  • late Middle English 1400–50
    • 1.See corresponding entry in Unabridged defunct, gone, vanished. See  dead. 
    • 2.See corresponding entry in Unabridged archaic.
    • 3.See corresponding entry in Unabridged out.

Collins Concise English Dictionary © HarperCollins Publishers::
extinct /ɪkˈstɪŋkt/ adj
  1. (of an animal or plant species) having no living representative; having died out
  2. quenched or extinguished
  3. (of a volcano) no longer liable to erupt; inactive
Etymology: 15th Century: from Latin exstinctus quenched, from exstinguere to extinguish
'extinct' also found in these entries:

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