swallowtail

noun

swal·​low·​tail ˈswä-lō-ˌtāl 

-lə-

1

: a deeply forked and tapering tail (as of a swallow)

2

: tailcoat

3

: any of various usually large brightly marked butterflies (family Papilionidae, especially genus Papilio) with each hind wing typically having an elongated process

swallow-tailed

ˈswä-lō-ˌtāld 

-lə-

adjective

Illustration of swallowtail

• swallowtail 3

Examples of swallowtail in a Sentence

Recent Examples on the Web

In 1976, the Schaus’ swallowtail butterfly became one of the first insects to be listed under the U.S. Endangered Species Act, Cabrera says. —Marina Wang, Smithsonian Magazine, 18 Apr. 2025

Different types of swallowtails, including western tiger, pale, and anise, can be seen at Jack’s Peak, Johnston says. —A.k. Whitney, Oc Register, 4 June 2025

Some swallowtail butterflies lay eggs on citrus trees. —Jessica Peralta, Oc Register, 4 June 2025

At the time, conservationists fretted that the enormous hurricane was going to wipe out the last of the island’s Schaus’ swallowtails (Papilio aristodemus), a species of endangered black-and-yellow butterfly native to southern Florida and now found only on Elliott Key and nearby Key Largo. —Marina Wang, Smithsonian Magazine, 18 Apr. 2025

Word History

First Known Use

1703, in the meaning defined at sense 1

Phrases Containing swallowtail

• black swallowtail
• tiger swallowtail

Rhymes for swallowtail

• abigail
• cottontail
• countervail
• fingernail
• martingale
• mesoscale
• microscale
• monorail
• nanoscale
• ponytail
• wensleydale
• yellowtail

Kids Definition

swallowtail

noun

swal·​low·​tail ˈswäl-ō-ˌtāl 

1

: a deeply forked and tapering tail (as of a swallow)

2

: any of various usually large butterflies in which the hind wing is elongated into a process that resembles a tail

swallow-tailed

ˌswäl-ō-ˈtāld

adjective