Where does “swallowtail” come from?

swallowtail (English) comes from English Tail, from Middle English tayl, from Old English tæġl, from Proto-Germanic taglą, from Proto-Indo-European doḱ-, from Proto-Indo-European deḱ- — take; perceive.

swallowtail (English): The forked tail of a swallow; Anything, such as a...

Definitions

  1. The forked tail of a swallow; Anything, such as a...

Ancestry of “swallowtail”, step by step

swallowtail traces back through two separate lines of ancestry.

via English Tail

StepLanguageWordMeaning
1EnglishTailA Chinese constellation coinciding with the tail of Scorpius, one of the 28 lunar mansions and the tail of Azure Dragon
2Middle EnglishtaylA tail; The back side or reverse of a creature; A...
3Old Englishtæġltail
4Proto-Germanictagląhair; ponytail; hair of a tail; tail
5Proto-Indo-Europeandoḱ-hair of the tail
6Proto-Indo-Europeandeḱ-take; perceive

via English swallow

StepLanguageWordMeaning
1EnglishswallowTo cause to pass from the mouth into the...
2Middle EnglishswalweA swallow or a swift; The meat of such birds
3Old Englishswealweswallow
4Proto-West Germanic*swalwāswallow (bird)
5Proto-Germanicswalwǭswallow
Every word from Proto-Indo-European deḱ-