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.
    1. coarse meal or porridge.
    2. grouts,groats.

verb (used with object)

  1. to fill or consolidate with grout.
  2. to use as grout.

pl n

  1. mainly British sediment or grounds, as from making coffee
  2. a variant of groats


  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


  1. (tr) to fill (joints) or finish (walls, etc) with grout

1580s, “thin, fluid mortar,” originally “coarse porridge,” perhaps from Old English gruta (plural) “coarse meal,” related to Old English grytta (see grits). As a verb from 1838. Related: grouted; grouting.

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