Metathetic from -t- infixed stem (cf. constr. *maltəˁōt in Ps 58.7). Cf. lōăˁ, a hapax in Pr 23:2, translated as ‘gullet’ in [HALOT 532]. The context, however, allows for both interpretations, ‘gullet’ and ‘jaw’, the latter supported by the meaning ‘jaw’ attested in Hbr. pB. [Jastrow 700].
Probably, related with suffixed -n and a highly specified meaning shift. Note also a variant root with an enigmatic -d as a third radical: luγd- (also luγdūd, liγdīd) ‘earlobe, the bottom of the ear; tender flesh between the palate and the swallowing canaľ [ibid. 1005], [WKAS II 883-4].