primer

primer (http://definr.com/primer)

     n 1: an introductory textbook
     2: any igniter by which an explosive charge is ignited [syn: fuse,
         fuze, fusee, fuzee, priming]
     3: the first or preliminary coat of paint or size applied to a
        surface [syn: flat coat, ground, priming, {primer
        coat}, priming coat, undercoat]