chalybeous,a.|kəˈlɪbɪəs| [f. L. chalybēius Chalybeian, of steel + -ous.] Of a steel-blue colour; dark blue with a metallic lustre. 1826Kirby & Spence Entomol. IV. xlvi. 283 Chalybeous... The blue splendour of steel case-hardened, or of the mainspring of a watch.