Thin mortar between tiles (5)
I believe the answer is:
grout
(Other definitions for grout that I've seen before include "coarsemeal" , "Mortar for tiling" , "Tile mortar" , "Grub" , "cement" .)
I believe the answer is:
grout
(Other definitions for grout that I've seen before include "coarsemeal" , "Mortar for tiling" , "Tile mortar" , "Grub" , "cement" .)