Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
bēlŭīnus (bell-), a, um, adj. [belua], brutal, bestial, animal (post-class.): voluptates, Gell. 19, 2, 2: fauces, Prud. Cath. 7, 114: pars corporis, Jul. Val. Rer. Gest. Alex. 3, 54.