Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
lĭbrārĭŏlus, i, m. dim. [2. librarius], a copyist, transcriber; a scribe, secretary, Cic. Att. 4, 4, 6; id. Balb. 6, 14: ex librariolis Latinis, id. Leg. 1, 2, 7.