/gal"it/ , Masonry.
n.
1. spall (def. 1).
v.t.
2. to fill (a mortar joint) with gallets.
Also, galet, garret .
[ 1705-15; galet pebble, OF galet, jalet, deriv. of ONF gal pebble (said to be gall "pillar stone, standing stone" is only point of comparison) ]