ὑποδιδάσκαλος
From LSJ
Περὶ τοῦ ἐπέκεινα τοῦ νοῦ κατὰ μὲν νόησιν πολλὰ λέγεται, θεωρεῖται δὲ ἀνοησίᾳ κρείττονι νοήσεως → On the subject of that which is beyond intellect, many statements are made on the basis of intellection, but it may be immediately cognised only by means of a non-intellection superior to intellection
English (LSJ)
ὁ,
A under-teacher, of a chorus, Pl.Ion536a; ὑ. τραγικός SIG692A31 (Delph., ii B. C.), al.: generally, Cic.Fam.9.18.4.