Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† phthĭsĭcus, a, um, adj., = φθισικός, consumptive, phthisical, Plin. 20, 6, 21, § 46; 24, 16, 19, § 28; 28, 17, 67, § 230; Vitr, 2, 9; Scrib. Comp. 186; Mart. 11, 21, 7.