/ slæb; NAmE / noun
1.
a thick flat piece of stone, wood or other hard material :
a slab of marble / concrete, etc.
The road was paved with smooth stone slabs .
paving slabs
a dead body on the slab (= on a table in a mortuary )
2.
a thick, flat slice or piece of sth :
a slab of chocolate
slabs of meat
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WORD ORIGIN
Middle English : of unknown origin.