Strong's G4600 · Greek

σιαγών

siagon · see-ag-one'

of uncertain derivation; the jaw-bone, i.e. (by implication) the cheek or side of the face

Scholarly Lexicons

Abbott-Smith Manual Greek Lexicon

 2 σιαγών , -όνος, ἡ [in LXX for לְחִי ;] the jawbone, jaw, cheek : Mt 5:39 , Lk 6:29 (cf. MM, xxii).† 

G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain