Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Cilnĭus, a, um, adj. [pure Etrusc. Cfelne or Cfenle], a designation of a very distinguished Etruscan gens, from which Mœcenas originated; Cilnian, Liv. 10, 3, 2; 10, 5, 13; Sil. 7, 29; Tac. A. 6, 11; Macr. S. 2, 4, 12.