slab > define

noun

• Block consisting of a thick piece of something. .

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

slab is a flat piece of concrete, typically used as a walking surface, but may also serve as a load bearing device as in slab homes.