A slab is a great big thick piece of something. Your backyard patio, for example, might be made of a huge slab of concrete.

A sidewalk is often composed of one cement slab after another — these are sometimes called paving slabs. You could refer to large pieces of stone or wood as slabs too. Even your lunch might be a slab, if it's a thick hunk of cheesy pizza or a huge slab of bread slathered with peanut butter. The origins of the word slab are unknown, though we do know it's been around since the thirteenth century.

Definitions of slab
  1. noun
    block consisting of a thick piece of something
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    butcher block, butcher board
    a thick wooden slab formed by bonding together thick laminated strips of unpainted hardwood
    a slab of stone or wood suitable for bearing an inscription
    a flat thin rectangular slab (as of fired clay or rubber or linoleum) used to cover surfaces
    a tablet placed horizontally on top of the capital of a column as an aid in supporting the architrave
    (formerly) a writing tablet made of slate
    a small square tile of stone or glass used in making mosaics
    type of:
    a solid piece of something (usually having flat rectangular sides)
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