Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
căpĭtātus, a, um, adj. [caput], having a head (rare): clavulus, Varr. R. R. 2, 9, 15: et crassa natrix, Lucil. ap. Non. p. 65, 31: caepa, Plin. 19, 6, 32, § 105: porrum, id. 20, 6, 22, § 48; Pall. Febr. 24, 11: herba, Plin. 24, 19, 113, § 173: cunila, id. 32, 10, 44, § 126: vinea, a vine that grows in a head (opp. bracchiata), Col. 5, 5, 9 and 11.