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Definition of swallowtail noun from the Oxford Advanced Learner's Dictionary

swallowtail

noun

/ˈswɒləʊteɪl/

/ˈswɑːləʊteɪl/

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a butterfly that has a thin tail on each back wing
- Swallowtails are well adapted to urban and suburban life.
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See swallowtail in the Oxford Advanced American Dictionary

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adjective

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