μύσταξ
From LSJ
English (LSJ)
ᾰκος, ὁ, Dor. and Lacon. for μάσταξ, and always masc., whereas μάσταξ is fem.:—
A upper lip or moustache, Stratt.65, Eub. 113, Theoc.14.4, LXX 2 Ki.19.24(25); the Spartan Ephors on coming into office issued an edict, κείρεσθαι τὸν μύστακα καὶ προσέχειν τοῖς νόμοις, Arist.Fr.539.