Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Caelĭŏlus (Coel-), i, m. dim. [Caelius], a part of the Cœlian Hill, Varr. L. L. 5, § 46 Müll. (in Cic. Har. Resp. 15, 32, Caelĭ-cŭlus; Mart. 12, 18, 6, Caelĭus Mĭnor)