1. 灭绝的;绝种的
    A species of animal or plant that is extinct no longer has any living members, either in the world or in a particular place.

    e.g. It is 250 years since the wolf became extinct in Britain.
           狼在英国已经灭绝250年了。
    e.g. ...the bones of extinct animals.
           灭绝动物的骨骼

2. （某类劳动者、生活方式或活动）不复存在的，废除了的
    If a particular kind of worker, way of life, or type of activity is extinct, it no longer exists, because of changes in society.

extinct的解释

    e.g. If the current trend continues, black farmers in the United States may be extinct by the end of this decade...
           如果当前趋势继续发展下去，美国的黑人农民将在这个十年末不复存在。
    e.g. Herbalism had become an all but extinct skill in the Western world.
           草药医术在西方已经成了一门几乎绝迹的技艺。

3. （火山）死的
    An extinct volcano is one that does not erupt or is not expected to erupt any more.

    e.g. Its tallest volcano, long extinct, is Olympus Mons.
           它最高的火山是早已熄灭的奥林波斯山。