from
The Collaborative International Dictionary of English v.0.48
Turnus \Tur"nus\, n. [NL., fr. L. Turnus, the king of the
Rutuli, mentioned in the Aeneid.] (Zool.)
A common, large, handsome, American swallowtail butterfly,
now regarded as one of the forms of {Papilio glaucus} syn.
{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}.
[1913 Webster]