Question

defunct 【defunct】adj.死的A family name becomes defunct when the only heir dies without any son.当唯一的继承人死了之后没儿子，那这个姓就要绝迹了。

Accepted Answer

[dɪ'fʌŋkt] 
defunctno longer in force or use; inactive
Defunct describes something that used to exist, but is now gone. A magazine that no longer publishes, like Sassy, the girl-power mag from the '90s, is defunct, for example.
Although defunct comes from the Latin word defunctus meaning "dead," it's not usually used to describe a person who's no longer with us, but rather institutions, projects, companies and political parties — you know, the boring stuff. Keep digging and you'll find that defunctus comes from defungi, meaning, "to finish," which is closer to how it's used today. Defunct can also refer to a rule or law that's no longer used or has become inactive, like prohibition.
All forms of 'defunct' will appear on average once every 3906 pages.defunctdefunctness

Front	defunct
Pron	[dɪ'fʌŋkt]
Back	【defunct】 adj.死的 A family name becomes defunct when the only heir dies without any son. 当唯一的继承人死了之后没儿子，那这个姓就要绝迹了。
Vocab	defunctno longer in force or use; inactive Defunct describes something that used to exist, but is now gone. A magazine that no longer publishes, like Sassy, the girl-power mag from the '90s, is defunct, for example. Although defunct comes from the Latin word defunctus meaning "dead," it's not usually used to describe a person who's no longer with us, but rather institutions, projects, companies and political parties — you know, the boring stuff. Keep digging and you'll find that defunctus comes from defungi, meaning, "to finish," which is closer to how it's used today. Defunct can also refer to a rule or law that's no longer used or has become inactive, like prohibition. All forms of 'defunct' will appear on average once every 3906 pages. defunct defunctness

Defunct Longer Defunctus Dɪ'Fʌŋkt Adj.死的 Family Heir Dies