a large, thick, flat piece of stone or concrete, typically square or rectangular in shape

paving slabs

she settled on a slab of rock

a large, thick slice or piece of cake, bread, chocolate, etc.

a slab of bread and cheese

an outer piece of timber sawn from a log

the slabs I trimmed away from the logs became the siding for the cabin walls

a pack containing 24 bottles or cans of beer

remove slabs from (a log or tree) to prepare it for sawing into planks

he slabbed the log on the two other remaining sides to make a rectangular timber