American Heritage Dictionary
(4)
Century Dictionary
(11)
GNU Webster's 1913
(2)
WordNet
(2)
Elsewhere on the web
After all grout was applied I removed the masking tape, cleaning up any tile edges and any irregularities in the setting of the mix.— BC Bloggers
Includes a Concentrator tool to give a directed steam jet for the difficult places such as grout lines, around the cooker, and stains.— lipstick.com: celebrity news that matters to you
With a double-sided tip and filled with bleach gel, it's designed to brighten up tile grout or to dab out tiny stains on clothing.— azcentral.com | news
Once the slate is ready to grout, be sure to apply a grout-release liquid on the top of the slate tiles.— AskTheBuilder.com

American Heritage Dictionary (1)
Century Dictionary (4)
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You can expect to see this word a few times a year.