Etymology
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grout (n.)

"thin, fluid mortar" used in joints of masonry and brickwork, 1580s, extended from sense "coarse porridge," perhaps from Old English gruta (plural) "coarse meal," from Proto-Germanic *grut-, from PIE root *ghreu- "to rub, grind" (see grit (n.)). As a verb from 1838. Related: grouted; grouting.

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Definitions of grout
1
grout (v.)
bind with grout;
grout the bathtub
2
grout (n.)
a thin mortar that can be poured and used to fill cracks in masonry or brickwork;
From wordnet.princeton.edu