Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
cartĭlāgĭnĕus, a, um, adj. [cartilago], cartilaginous, gristly, Plin. 9, 24, 40, § 78; 11, 37, 87, § 215; 19, 5, 23, § 64.