langue morte

listen to the pronunciation of langue morte
Fransızca - Türkçe
ölü dil
Fransızca - İngilizce
dead language

It's a dead language. - C'est une langue morte.

How long can a dead language survive? - Combien de temps une langue morte peut-elle vivre ?

a language which no longer has any native speakers
a language that is no longer learned as a native language
language that is no longer spoken
A language, such as Latin, that is no longer learned as a native language by a speech community