slabs is a form of:

Slab



ENGLISH MEANING
noun
1.
A thin piece of anything, especially of marble or other stone, having plane surfaces.
2.
An outside piece taken from a log or timber in sawing it into boards, planks, etc.
3.
The slack part of a sail.
4.
That which is slimy or viscous; moist earth; mud; also, a puddle.
1.
The wryneck
2.
Thick, viscous