1.
A species of animal or plant that is ~ no longer has any living members, either in the world or in a particular place.
It is 250 years since the wolf became ~ in Britain.
ADJ
2.
If a particular kind of worker, way of life, or type of activity is ~, it no longer exists, because of changes in society.
Herbalism had become an all but ~ skill in the Western world.
ADJ
3.
An ~ volcano is one that does not erupt or is not expected to erupt any more.
Its tallest volcano, long ~, is Olympus Mons.
ADJ