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  1. a thin, coarse mortar poured into various narrow cavities, as masonry joints or rock fissures, to fill them and consolidate the adjoining objects into a solid mass.
  2. a coat of plaster for finishing a ceiling or interior wall.
  3. Usually grouts. lees; grounds.
  4. Archaic.
    1. coarse meal or porridge.
    2. grouts,groats.
verb (used with object)
  1. to fill or consolidate with grout.
  2. to use as grout.

Origin of grout

before 1150; Middle English; Old English grūt; see grits, groats, grit
Related formsgrout·er, nounun·grout·ed, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for grout


  1. a thin mortar for filling joints between tiles, masonry, etc
  2. a fine plaster used as a finishing coat
  3. coarse meal or porridge
  1. (tr) to fill (joints) or finish (walls, etc) with grout
Derived Formsgrouter, noun

Word Origin for grout

Old English grūt; related to Old Frisian grēt sand, Middle High German grūz, Middle Dutch grūte coarse meal; see grit, groats
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for grout

1580s, "thin, fluid mortar," originally "coarse porridge," perhaps from Old English gruta (plural) "coarse meal," related to Old English grytta (see grits). As a verb from 1838. Related: grouted; grouting.

Online Etymology Dictionary, © 2010 Douglas Harper