primer in WordNet English dictionary

1. the first or preliminary coat of paint or size applied to a surface
   flat coat  ground  primer  priming  primer coat  priming coat  undercoat 
   
2. any igniter that is used to initiate the burning of a propellant
   fuse  fuze  fusee  fuzee  primer  priming 
   
3. an introductory textbook
   primer