book tile
noun
a flat, cellular roofing tile having two parallel edges one of which is convex and the other concave, so that a number may be fit together edge to edge between rafters, joists, etc.
Words nearby book tile
book out,
book rest,
book review,
book share,
book society,
book tile,
book token,
book up,
book value,
book-keeping,
book-learning