\Tur"nus\, n. [NL., fr. L. Turnus, the king of the
Rutuli, mentioned in the [AE]neid.] (Zo["o]l.)
A common, large, handsome, American swallowtail butterfly,
now regarded as one of the forms of {Papilio, or Jasoniades,
glaucus}. The wings are yellow, margined and barred with
black, and with an orange-red spot near the posterior angle
of the hind wings. Called also {tiger swallowtail}. See
Illust. under {Swallowtail}.