The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
transitive verb stone·washed, stone·wash·ing, stone·wash·es
To wash (garments or material, usually denim) in large industrial machines with pumice pebbles to soften and abrade the material by friction.