LSJ
μύρον, a perfumed unguent named after the inventor Megallos (cf. Ar. Fr. 536, Stratt. 33), Pherecr. 140, Anaxandr. 46, Eub. 90.6, Amphis 27, cf. Dsc. 1.58; — wrongly written μεγαλεῖον in Thphr. Od. 29, al.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)