Liddell-Scott-Jones

μύσταξ (mustax) a mustache ^G:N-M

μύσταξ, ᾰκος, ὁ,

Doric dialect and Laconian dialect for μάσταξ, and always masculine, whereas μάσταξ is feminine:— upper lip or moustache, [LXX+5th c.BC+]; the Spartan Ephors on coming into office issued an edict, κείρεσθαι τὸν μύστακα καὶ προσέχειν τοῖς νόμοις, [Refs 4th c.BC+]

_{LSJ Scripture Refs: LXX.2Kgs.19.24}