ὑπερβολ-αῖος · hyperbol-aios — LSJ
added, additional; of notes or strings, Pherecr. 145.26; fem., of the highest tetrachord in the two-octave scale, Aristox. (?) Oxy. 667.18; in gen. pl., Euc. Sect.Can. 10, Plu. An.procr. 2.1029a; ὑπερβολαία, ἡ, the νήτη of the tetrachord ὑπερβολαίων, Theo Sm. p.89 H., Ptol. Harm. 3.8, cf. Ph. 1.111.