Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† hystrix (histrix), ĭcis, f., = ὕστριξ, a porcupine, Plin. 8, 35, 53, § 125; Calp. Ecl. 6, 14; Claud. Idyll. 4.