- A hydrous mortar whose consistency allows it to be placed or pumped into small joints or cavities, as between pieces of ceramic clay, slate, and floor tile.
- Various mortar mixes used in foundation work to fill voids in soils, usually through successive injections through drilled holes.
- noun thin mortar used to fill gaps, especially between tiles
- noun fine plaster used to finish ceilings and walls
- verb to use grout to fill gaps, especially between tiles, or to finish a ceiling or wall