Main entry: extinct, nonextant
Definition: no longer in existence; lost or especially having died out leaving no living representatives
Usage: an extinct species of fish; an extinct royal family; extinct laws and customs
Antonyms: extant
Definition: still in existence; not extinct or destroyed or lost
Antonyms: living
Definition: people who are still living
Definition: possessing life
Antonyms: live
Definition: exerting force or containing energy
Main entry: nonextant
Definition: no longer existing or inaccessible through loss or destruction
Usage: its nonextant original was written on vellum- G.B.Saul