Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. arbuscŭla, ae, f. dim. [from arbor, as majusculus, minusculus, from major, minor].
2. Arbuscŭla, ae, f., the name of a mimic actress in the time of Cicero, Cic. Att. 4, 15; Hor. S. 1, 10, 77.