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noun swal·low·tail \ˈswä-lō-ˌtāl, -lə-\

Definition of swallowtail

  1. 1 :  a deeply forked and tapering tail (as of a swallow)

  2. 2 :  tailcoat

  3. 3 :  any of various usually large brightly marked butterflies (family Papilionidae, especially genus Papilio) with each hind wing typically having an elongated process


play \-ˌtāld\ adjective

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