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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.]

  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. [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.