Grout (noun)

1. A material used to fill the gaps between tiles, bricks or other building materials.
2. A mixture of cement, sand, and water used to fill and seal gaps in masonry work.

Origin:

From the old french word "gros" meaning "coarse", and later from the middle english word "grou(t)", which is a variant of "grit".

Examples:

1. He used a trowel to apply the grout between the tiles.
2. The grout was used to seal the gaps between the bricks.
3. He mixed cement, sand and water to make the grout.
4. Grout is used to fill the gaps between ceramic tiles.
5. He cleaned the excess grout off the tiles with a damp sponge.