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a. A thin mortar used to fill cracks and crevices in masonry.
b. A thin plaster for finishing walls and ceilings.
2. often grouts Chiefly British Sediment; lees.
tr.v. grout·ed, grout·ing, grouts
To fill or finish with a thin mortar or plaster.
[Middle English, grain used for making malt, mud, from Old English grūt, coarse meal.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
grout, esp after it has been applied
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014