ex·tant /ˈɛkstənt; ɛkˈstænt, ˈɛkˌ/
  (a.)現存的,未毀的
  Ex·tant a.
  1. Standing out or above any surface; protruded.
     That part of the teeth which is extant above the gums.   --Ray.
     A body partly immersed in a fluid and partly extant.   --Bentley.
  2. Still existing; not destroyed or lost; outstanding.
     Writings that were extant at that time.   --Sir M. Hale.
     The extant portraits of this great man.   --I. Taylor.
  3. Publicly known; conspicuous. [Obs.]
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  extant
       adj : still in existence; not extinct or destroyed or lost;
             "extant manuscripts"; "specimens of graphic art found
             among extant barbaric folk"- Edward Clodd [ant: extinct]