1 [slab]
a broad, flat, somewhat thick piece of stone, wood, or other solid material.
a thick slice of anything: a slab of bread.
a semifinished piece of iron or steel so rolled that its breadth is at least twice its thickness.
a rough outside piece cut from a log, as when sawing one into boards.
Baseball Slang. rubber ( def 14 ).
Building Trades. a section of concrete pavement or a concrete floor placed directly on the ground or on a base of gravel.
verb (used with object), slabbed, slabbing.
to make into a slab or slabs.
to cover or lay with slabs.
to cut the slabs or outside pieces from (a log).
to put on in slabs; cover thickly.

1250–1300; Middle English sclabbe, slabbe < ? Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
slab (slæb)
1.  a broad flat thick piece of wood, stone, or other material
2.  a thick slice of cake, etc
3.  any of the outside parts of a log that are sawn off while the log is being made into planks
4.  mountaineering a flat sheet of rock lying at an angle of between 30° and 60° from the horizontal
5.  a printer's ink table
6.  (Austral), (NZ) (modifier) made or constructed of coarse wooden planks: a slab hut
7.  informal chiefly (Brit) an operating or mortuary table
8.  informal chiefly (Brit), (Austral) a package containing 24 cans of beer
vb , slabs, slabbing, slabbed
9.  to cut or make into a slab or slabs
10.  to cover or lay with slabs
11.  to saw slabs from (a log)
[C13: of unknown origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 13c., of unknown origin, possibly related to O.Fr. escalpe "thin fragment of wood," which seems to be a Gaulish loan word (cf. Bret. scolp, Welsh ysgolp "splinter, chip"). But OED rejects this on formal grounds. Meaning "rectangular block of pre-cast concrete used in building" is from 1927.
Online Etymology Dictionary, © 2010 Douglas Harper
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