Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
littĕrārĭus(lītĕr-), a, um, adj. [littera], of or belonging to reading and writing:ludus, an elementary school,Quint. 1, 4, 27;Tac. A. 3, 66;Plin. 9, 8, 8, § 25;Suet. Calig. 45:magister. an elementary teacher, schoolmaster,Vop. Pertin. 8.