(prim′ər) noun
1. An elementary textbook; especially, a beginning reading book.
2. Originally, a small prayer book or the like.
3. Printing Either of two sizes of type, great primer (18–point) and long primer (10–point). [<Med. L primarius]

(prī′mər) noun
1. Any device, as a cap, tube, etc., used to detonate the main charge of a gun, mine, etc.
2. One who or that which primes.

(prim′ər, prī′mər) adjective Obs.
First; original; primary. [<OF <L primarius <primus prime]