What does the word primer mean?

Usage examples for primer

  1. This will act as a primer or undercoat for the succeeding coats of paint. – Advanced Toy Making for Schools by David M. Mitchell
  2. You always know at any moment what that nice young man is thinking about; he is written like a primer in big type and one- syllable words. – Dear Enemy by Jean Webster
  3. At the same time the gun crew swung the gun out and fired a primer to indicate how quickly they could have fired a real shot. – The Victory At Sea by William Sowden Sims Burton J. Hendrick