Meaning of rimfire

rim•fire

Pronunciation: (rim'fīr"), [key]
— adj.
  1. (of a cartridge) having the primer in a rim encircling the base. Cf.(def. 1).
  2. (of a firearm) designed for the use of such cartridges.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.