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. 2019

British Dictionary definitions for un-grouted


  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 un-grouted



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