Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
hystrĭcŭlus, a, um, adj. [hystrix], prickly, hairy, bearded (post-class.): hystriculus, δασύπρωκτος, Gloss. Philox.: pusio, Arn. 5, 174: puer, Tert. Pall. 4 dub. (al. striculus, ustriculus).