Webster's English Dictionary

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primer

1. prim.er \'prim-*r, esp Brit 'pri--m*r\ n [ME, fr. ML primarium, fr. LL, 
   neut. of primarius primary] 1: a small book for teaching children to read  
   2: a small introductory book on a subject 
2. prim.er \'pri--m*r\ n 1: a device for priming; esp : a cap, tube, or 
   wafer containing per cussion powder or compound used to ignite an explosive 
   charge 2: PRIMING