LSJ
ή, όν, of or for a choir; pueri symphoniaci, singing boys, Cic. Mil. 21.55. ἡ συμφωνιακή, a variety of ὑοσκύαμος, Pall. Agr. 11.12.8, Apul. Herb. 4; ὑοσκύαμος κή Hippiatr. 22; cf. σύμφωνος III.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)