Lewis & Short

psōrĭcus, a, um, adj., = ψωρικός, of or for the itch or mange: medicamentum, good for the itch, Plin. 34, 12, 29, § 119: collyrium, Scrib. Comp. 32.
As subst.: psō-rĭcum, i, n., a remedy for the itch, Cels. 6, 6, 31.