Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
prīdĭānus, a, um, adj. [pridie], of or belonging to the day before, that happened, was used, eaten, etc., the day before, yesterday’s (post-Aug.): pridiana ac semesa opsonia apposuit, Suet. Tib. 34; id. Vit. 13: cibus, id. Calig. 58: balinea, Plin. 28, 19, 77, § 248: reliquiae, Cat. ap. App. Mag. p. 277, 13: pluvia, App. M. 7, p. 196, 34: pruina, id. ib. 11, p. 260, 19.