形容詞 extinct:

1. no longer in existence; lost or especially having died out leaving no living representatives
   同義詞：nonextant
2. (of e.g. volcanos) permanently inactive
3. being out or having grown cold
   同義詞：out

1. A genus of extinct, large, flightless birds native to Madagascar.
   象鳥(niǎo)，隆鳥(niǎo)一種不會(huì)飛的巨鳥(niǎo)，產(chǎn)于馬達(dá)加斯加島，現(xiàn)已絕種
2. An extinct volcano.
   一座死火山
3. Dinosaurs have been extinct for millions of years.
   恐龍已絕種幾百萬(wàn)年了。

ex.tinct

adj.Abbr. ext.（形容詞）縮寫(xiě) ext.
No longer existing or living:
滅絕的：不再存在的或不再活的：
例句：
an extinct species.
一個(gè)滅絕的種

No longer burning or active:
熄滅的：不再燃燒的，不再活躍的：
例句：
an extinct volcano.
一座死火山

No longer in use:
廢除了的：
例句：
an extinct custom.See Synonyms at dead
廢除了的習(xí)俗參見(jiàn) dead

Law Lacking a claimant; void:
【法律】 過(guò)時(shí)的；失效的：
例句：
an extinct title.
一個(gè)失效的頭銜

來(lái)源：
Middle English
中古英語(yǔ)
from Latin exstonctus [past participle of] exstinguere [to extinguish] * see extinguish
源自 拉丁語(yǔ) exstonctus [] exstinguere的過(guò)去分詞 [滅絕] *參見(jiàn) extinguish