a. The upper or outer edge of an object, especially when curved or circular. See Synonyms at border.
b. The upper edge of a steep slope; a cliff or brink: the rim of a canyon.
a. The circular outer part of a wheel, furthest from the axle.
b. A circular metal structure around which a wheel tire is fitted.
tr.v. rimmed, rim·ming, rims
1. To furnish with a rim.
2. Sports To roll around the rim of (a basket or golf cup, for example) without falling in.
3. Vulgar Slang To perform anilingus on.
[Middle English, from Old English rima.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.