σιαγόνιον

τό
A. the parts under or near-the jaw, Hp. Morb. 2.26, LXX De. 18.3.
II. cheek-piece, side-piece, in military engines, Ath.Mech. 35.5, Apollod. Poliorc. 183.3, 188.4.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project