ὑφέν
ὑφέν, earlier ὑφ’ ἕν, Adv.
A). in one, as a single word, ἀναγιγνώσκειν ὑφ’ ἕν ; 2.31e πῶς .. πληθυντικὸν καὶ ἑνικὸν ὑφ’ ἓν κεκλήσεται; how can a plural and a singular be addressed in one and the same word? Pron. 22.7 .
2). ἡ ὑφέν the hyphen, a sign (&) written below two consecutive letters to show that they belong to the same word, Supp. 674.4 , Sch.D.T. p.126H., Diom. p.434 K., PAmh. 2.21.6 (iii/iv A. D.).