extinct in WordNet English dictionary

1. no longer in existence; lost or especially having died out leaving no living representatives
   "an extinct species of fish"; "an extinct royal family"; "extinct laws and customs"
   extinct  nonextant 
   
2. (of e.g. volcanos) permanently inactive
   "an extinct volcano"
   extinct 
   
3. being out or having grown cold
   "threw his extinct cigarette into the stream"; "the fire is out"
   extinct  out