rimn.[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.()v. t. To furnish with a rim; to border.()