vestigial

[ve'stidʒiəl]

释义

adj.残留的，退化的
Occurring or persisting as a rudimentary or degenerate structure.

例句
Howard：The last girl my mom set me up with had a mustache and a vestigial tail.(The Big Bang Theory)
霍华德：我妈上次给我找的相亲女孩留着小胡子，长了根没进化好的尾巴。（生活大爆炸）