Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
mellītŭlus, a, um, adj. dim. [mellitus], honey-sweet, darling (ante- and post-class.): corpusculum mellitulum! (al. melliculum), Plaut. Cas. 4, 4, 19: puella, Hier. Ep. 79, 6.
Subst.: mellītŭla, ae, f., little honey: mea mellitula, App. M. 3, 139, 3.