a unit of a prison consisting of a number of cells.

cell1 + block

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To cellblock
Example sentences
These units still adhere to their cellblock plan, and space is tight.
He walks along the cellblock handing out cans through the bars and then drops
The prison is home to the tallest steel cellblock in the world.
The other type puts out a small amount of interference, and you could
  potentially confine it within a single cellblock.
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