Longman Dictionary of Contemporary English homepage

slab

 noun
     
Related topics: Construction
slab [countable]
1TBC a thick flat piece of a hard material such as stone:
a concrete slab
paving slabs
slab of
They used a slab of concrete as a lid.
2

slab of cake/chocolate/meat etc

a large flat piece of cake etc
3

on the slab

informal lying dead in a hospital or mortuary
Definition from the Longman Dictionary of Contemporary English
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