n. The border, edge, or margin of anything, whether forming part of the thing itself, or separate from it and surrounding or partly surrounding it, most commonly a circular border, often raised above the inclosed surface: as, the rim of a hat.n. Specifically In a wheel, the circular part furthest from the axle, connected by spokes to the hub, nave, or boss.n. Synonyms The rim of a vessel; the brim of a cup or goblet; the brink, verge, or edge of a precipice; the margin of a brook or a book; the border of a garment or a country.To surround with a rim or border; form a rim round.To plow or slash the sides of, as mackerel, to make them seem fatter.n. A membrane.n. The membrane inclosing the intestines; the peritoneum; hence, loosely, the intestines; the belly.n. The pawl-race or ratchet-ring of a capstan.