Abbott-Smith Manual Greek Lexicon
πυγμή (G4435)
1 πυγμή , -ῆς, ἡ , [in LXX: Ex 21:18 , Is 58:4 ( אֶגְרוֹף )*;] the fist : πυγμῇ νίψασθαι τ. χεῖρας (T, πυκνά ; Vg., Goth., Copt., crebro ), to wash the hands with the fist ( diligently , R, txt.; up to the elbow , R, mg.; the exact meaning is doubtful; v. Swete, in l.): Mk 7:3 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain