PWS
*pakk- - jaw, joint of the jaw
(SED I No. 212)
Rather scarce but reliable attestation. -n- in one of the Arb. forms may imply Sem. *pank- > *pakk-. Cf. a variant root *pagg- ‘jaw’: Hbr. pB. pag (Jastrow 1132); Jud. pagga (ibid.), Syr. pagga (LSyr. 555).