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keene’s cementa cement composed of finely ground, anhydrous, calcined gypsum, the set of which is accelerated by the addition of other materials.
  
kerfa slot cut into the edge of a stone with a saw blade for insertion of anchors.
  
keystonethe last wedge-shaped stone placed in the crown of an arch, regarded as binding the whole.
  
knockingsthe oversize residue obtained in screening a ceramic slip. 
  
kyanitethe most abundant of the mineral polymorphs that include andalusite and sillimanite. kyanite is used as a source of mullite in ceramics.