- swallowtail (n.)
[swallowtail 词源字典]
- also swallow-tail, 1540s as a type of arrowhead, from swallow (n.1) + tail (n.). Of a type of butterfly, by 1776; of a type of coat, 1835. As an adjective from 1590s. The bird's tail is long and deeply forked.[swallowtail etymology, swallowtail origin, 英语词源]