Definition of black swallowtail
: a usually dark-colored New World swallowtail (Papilio polyxenes) having yellow spots on the wing margins and a black spot centered within a larger orange spot on the hind wing inner edge
First Known Use of black swallowtail
Seen and Heard
What made you want to look up black swallowtail? Please tell us where you read or heard it (including the quote, if possible).