1. (n.) A coat worn under another; a light coat, as distinguished from an overcoat, or a greatcoat.

2. (n.) A growth of short hair or fur partially concealed by a longer growth; as, a dog's undercoat.

chromogen coat coat of paint coating color color filter color gelatin colorant coloring dead-color distemper drier dye dyestuff exterior paint flat coat flat wash floor enamel ground interior paint medium opaque color paint pigment prime coat primer priming stain tempera thinner tinction tincture transparent color turpentine turps undercoating vehicle wash wash coat