noun Architecture.
a shallow rectangular feature projecting from a wall, having a capital and base and usually imitating the form of a column.

1565–75; pile1 (in obsolete sense “pillar”) + -aster1, modeled on Italian pilastro or Medieval Latin pīlastrum

underpilaster, noun
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World English Dictionary
pilaster (pɪˈlæstə)
a shallow rectangular column attached to the face of a wall
[C16: from French pilastre, from Latin pīla pillar]

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

a square column, 1575, from M.Fr. pilastre (1545), from It. pilastro, from M.L. pilastrum (1341), from pila, "buttress, pile" (from L. pila, see pillar) + L. -aster, suffix expressing "incomplete resemblance."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
As they entered they beheld a shield suspended from a pilaster of gold.
Headrails shall be clamped on or set into top of each pilaster and secured to
  building walls.
Similar pilaster and brickwork appear on other facades of the building.
The one-story central piazza is supported by six pairs of square columns with
  one pilaster at each return.
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