Etymology
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swallowtail (n.)

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.

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Definitions of swallowtail

swallowtail (n.)
a man's full-dress jacket with two long tapering tails at the back;
Synonyms: swallow-tailed coat / morning coat
From wordnet.princeton.edu

Dictionary entries near swallowtail

Swahili

swain

SWAK

swale

swallow

swallowtail

swam

swami

swamp

swamper

swamp-land