Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. ūtrĭcŭlus, i, m. dim. [1. uter], a small skin or leathern bottle, Cels. 2, 17; App. M. 1, p. 108, 16.
2. ū̆trĭcŭlus, i, m. dim. [uterus].