Source : Webster's Revised Unabridged Dictionary (1913)

Lute \Lute\, v. t. [imp. & p. p. {Luted}; p. pr. & vb. n.
   {Luting}.]
   To close or seal with lute; as, to lute on the cover of a
   crucible; to lute a joint.

Luting \Lut"ing\, n. (Chem.)
   See {Lute}, a cement.

Source : WordNet®

luting
     n : a substance for packing a joint or coating a porous surface
         to make it impervious to gas or liquid [syn: {lute}]