Lewis & Short

† cūmātĭlis (cȳm-), e, adj. [from κῦμα, with the Lat. ending ilis].

  1. I. Adj., of the waves: deus, i. e. Neptune, Commod. 10, 1.
    1. B. Esp., sea-colored, water-colored, blue: colos, Titin. ap. Non. p. 548, 11 (Com. Rel. v. 114 Rib.).
  2. II. Subst.: cūmātĭle, is, n., a bluish garment, Plaut. Ep. 2, 2, 49.