A fragment of stone broken off by a mason's chisel; a spall.(noun)
To insert small pieces of stone into the joints of, as coarse masonry: as, to gallet a wall. Parker. Also garret.
The Century Dictionary (Public Domain)
Use "gallet" in a sentence
"real male preppies don't wear scent. i married and divorced one. but in a fantasy world they wear floris no. 89, roger et gallet bouquet imperial, hermès équipage and the original zegna."
"The women exclaim and moan with delight as they inhale the peach gallet (that’s gay for pie-cobbler-thingy)."