Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A large rounded mass of rock lying on the surface of the ground or embedded in the soil.

from The Century Dictionary.

  • noun A loose rock, or one which has been torn from its native bed and transported to some distance.
  • To wear smooth, as an emery-wheel, by abrading with small flint pebbles. Also spelled bowlder.

from the GNU version of the Collaborative International Dictionary of English.

  • noun Same as bowlder.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A large piece of stone that can theoretically be moved if enough force is applied.
  • noun geology A particle greater than 256 mm in diameter, following the Wentworth scale
  • verb To engage in bouldering

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a large smooth mass of rock detached from its place of origin
  • noun a town in north central Colorado; Rocky Mountains resort center and university town

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Middle English bulder, of Scandinavian origin; see bhel- in Indo-European roots.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Middle English bulder, possibly from Swedish bullersten ("noisy stone"), or possibly from Dutch bolder

Support

Help support Wordnik (and make this page ad-free) by adopting the word boulder.

Examples

Comments

Log in or sign up to get involved in the conversation. It's quick and easy.

  • A lump of rock must be bigger than 256 millimetres (just over ten inches) to be a boulder, according to geologists' Udden-Wentworth scale.

    February 26, 2007