Lewis & Short

mŏnōdia, ae, v. monodium.

mŏnōdĭum, ĭi, n., = μονῴδιον, the song of a solo-singer, Diom. p. 489.
Also called mŏnōdĭa, ae, f., = μονῳδία, Isid. Orig. 6, 19, 6.