Webster's English Dictionary

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swallowtail

swal.low.tail \'swa:l-o--.ta-l, -*-\ \-.ta-ld\ n 1: a deeply forked and 
   tapering tail (as of a swallow)  2: TAILCOAT  3: any of various large 
   butterflies (esp. genus Papilio) with the bor der of the hind wing produced 
   into a process resembling a tail - swal.low-tailed aj