Meaning of PILASTER in English

PILASTER

[pi.las.ter] n [MF pilastre, fr. It pilastro] (1575): an upright architectural member that is rectangular in plan and is structurally a pier but architecturally treated as a column and that usu. projects a third of its width or less from the wall

Merriam-Webster English vocab.      Английский словарь Merriam Webster.