Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Cĕnŏmāni, ōrum, m., = Κενομανοί, a Celtic people in Gallia Cisalpina, Plin. 3, 19, 23, § 130; Liv. 5, 35, 1; Caes. B. G. 7, 75; v. Dict. of Geog.