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Definition of: swallowtail
Our photo definition of swallowtail 
(swol′ō·tāl′) noun
1. Colloq. A man's dress coat with two long, tapering skirts or tails.
2. A butterfly (family Papilionidae) having a posterior, tail–like prolongation on each hind wing.
—swal′low–tailed′ adjective
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