alcyonēus and -nius (halc-), a, um, adj. Alcyone, pertaining to Alcyone or alcyon (v. alcedo). Alcyonei dies = alcedonia (q. v.), Col. 11, 2.
— Alcyoneum medicamen, or absol.: alcyonēum, i, n., or even alcyonium. sea-foam, used as a remedy for spots on the face: alcyoneo utuntur ad oculorum cicatrices, Plin. 32, 8, 27, ยง 86; cf. Cels. 5, 6, 18, n. 26.