The Collaborative International Dictionary of English v.0.48:

Grout \Grout\, v. t. [imp. & p. p. Grouted; p. pr. & vb. n.
   Grouting.]
   To fill up or finish with grout, as the joints between
   stones.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Grouting \Grout"ing\, n.
   The process of filling in or finishing with grout; also, the
   grout thus filled in. --Gwilt.
   [1913 Webster]