νείαιρᾰ · neiaira — LSJ
lower, the lower part of
fem. Adj. (formed like γέραιρα) with comp. sense, lower, νειαίρῃ δʼ ἐν γαστρί in the lower part of the belly, Il. 5.539, 616, cf. Hp. ll.cc.; νείαιραν σάρκα Nic. l.c.:—also νέαιρα, νέαιραν γνάθον Simon. 244.
II abdomen
Subst., ἡ νείαιρα the abdomen, βάρος ἐν νειαίρῃ Hp. Coac. 579, cf. Call. l.c.; cf. νειρός (A). (Cogn. with νέατος (A): orig. perh. *νήαιρα, whence νέαιρα (lengthd. to νείαιρα in text of Hom.), contr. *νῇρα, whence νεῖρα.)