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pilaster (n.)

"a square column or pillar," 1570s, from French pilastre (1540s), from Italian pilastro, from Medieval Latin pilastrum (mid-14c.), from pila, "buttress, pile" (from Latin pila, see pillar) + Latin -aster, suffix "expressing incomplete resemblance" [Barnhart].

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Definitions of pilaster from WordNet

pilaster (n.)
a rectangular column that usually projects about a third of its width from the wall to which it is attached;
From wordnet.princeton.edu