A.peg or key by which the strings of an instrument are tuned, ἐ. ψαλτηρίου (-ήριον cod.) prob. in Ath.10.456d : metaph., “ἡ συντροφία ὥσπερ ἐ. ἐστι τῆς εὐνοίας” Plu.2.3d.
2. pitch-pipe for giving the note to a choir, Et.Gud.d. s.v. ἀπότομον.
II. any peg shaped like ἐ. I. Orib.49.4.26, al.; handle of a tap, turn-cock, Hero Aut.13.5, VarroRR3.5.16, Vitr.9.8.11, Ulp. ap. Dig.19.1.17.8 ; handle of a syringe, Hero Spir.2.18.
2. valve or stop in an organ-pipe, Vitr.10.8.5.
3. pl., sockets in which a roller was set, Bito 49.10.