grout

[grout]
noun
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.
a.
coarse meal or porridge.
b.
grouts, groats.
verb (used with object)
5.
to fill or consolidate with grout.
6.
to use as grout.

Origin:
before 1150; Middle English; Old English grūt; see grits, groats, grit

grouter, noun
ungrouted, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
grout (ɡraʊt)
 
n
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
 
vb
4.  (tr) to fill (joints) or finish (walls, etc) with grout
 
[Old English grūt; related to Old Frisian grēt sand, Middle High German grūz, Middle Dutch grūte coarse meal; see grit, groats]
 
'grouter
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

grout
1587, "thin, fluid mortar," originally "coarse porridge," from O.E. gruta (pl.) "coarse meal," related to O.E. grytta (see grits).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He also replaced the old grout and cleaned, buffed, and sealed the tile to
  bring out its vibrant yellow hue.
After completing the design and allowing the caulking to dry, she applied tile
  grout and left it to dry overnight.
The tile is crooked and warped, its inferior grout as porous as a sponge.
Since then, millions of tons of grout have been pumped into the empty caverns,
  which have now been sealed for good.
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