5. An arrow.
6. (Science: zoology) Any one of numerous species of large and handsome butterflies, belonging to papilio and allied genera, in which the posterior border of each hind wing is prolongated in the form of a long lobe.
The black swallowtail, or asterias (see papilio), the blue swallowtail, or philenor, the tiger swallowtail, or turnus (see Turnus), and the zebra swallowtail, or ajax (see under Zebra) are common American species. See also troilus.