extinct
/ɪkˈstɪŋkt/adjective
1- (of a species, family, or other larger group) having no living members（生物的种、科或其他更大种群）灭绝的, 绝种的：
trilobites and dinosaurs are extinct.
三叶虫和恐龙已经绝种。
1.1
- often humorous no longer in existence〈常幽默〉不复存在的; 绝迹的：
the sort of girls' school that is now extinct.
那种现已不复存在的女子学校。
1.2
- (of a volcano) not having erupted in recorded history（火山）死的, 不活动的。
1.3
- no longer alight熄灭了的：
his now extinct pipe.
他那已熄灭的烟斗。
1.4
- (of a title of nobility) having no qualified claimant（贵族称号）无合法继承人的。
词源
late Middle English （in the sense 'no longer alight'）： from Latin exstinct- 'extinguished', from the verb exstinguere （see EXTINGUISH）.