The Collaborative International Dictionary
nonextant
nonextant \nonextant\ adj. No longer existing; inaccessible through loss or destruction.
Its nonextant original was written on vellum
--G. B.
Saul
Wiktionary
nonextant
a. Not extant.
WordNet
nonextant
adj. 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" [syn: extinct] [ant: extant]
no longer existing or inaccessible through loss or destruction; "its nonextant original was written on vellum"- G.B.Saul