Rim (?), n. [As. rima, reoma, edge; cf. W. rhim, rhimp, a rim, edge, boundary, termination, Armor, rim. Cf. Rind.] 1. The border, edge, or margin of a thing, usually of something circular or curving; as, the rim of a kettle or basin.
2. The lower part of the abdomen. Shak.
Arch rim(Phonetics), the line between the gums and the palate. — Rim-fire cartridge. (Mil.) See under Cartridge. — Rim lock. See under Lock.