Lewis & Short

ĭanthĭnus, a, um, adj., = ἰάνθινος, violet-blue, violet-: color, Plin. 21, 8, 22, § 45: vestis, id. 21, 6, 14, § 27.
Subst.: ĭan-thĭnum, i, n., violet, the color, Dig. 32, 70, § 13.
Plur.: ĭanthĭna, ōrum, violet-colored garments, Mart. 2, 39, 1.