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