\▐ jet\ n [ME, fr. MF jaiet, fr. L gagates, fr. Gk gagatēs, fr. Gagas, town and river in Asia Minor] (14c) Term used to describe the blackness or intensity of the mass tone of black or near black surfaces. It is frequently used to describe dark blues, blue–black or black pigments. (Billmeyer FW, Saltzman M (1966) Principles of color technology. Wiley, New York).