Webster's 1828 Dictionary
BASILICON
n.s as z. [Gr. royal. ] An ointment. This name is given to several compositions in ancient medical writers. At present it is confined to three officinal ointments, distinguished into black, yellow and green basilicon.
Webster's 1913 Dictionary
BASILICON
Ba *sil "i *con, n. Etym: [L. basilicon, Gr. , neut. of: cf. F.basilicon. See Basilica. ] (Med. )
Defn: An ointment composed of wax, pitch, resin, and olive oil, lard, or other fatty substance.