Emily Dickinson Lexicon

RIM, n. [Sax. rima and reoma, a rim, a ream; W. rhim and rhimp, a rim, edge, termination; hence crimp, a sharp ridge; crimpiaw, to form into a ridge; also to pinch. Rim, like ramp, ramble, is from extending; the extremity. In Russ. kroma is a border.]

1. The border, edge or margin of a thing; as, the rim of a kettle or basin; usually applied to things circular or curving.
2. The lower part of the belly or abdomen. – Brown.