Definition of pilaster noun from the Oxford Advanced Learner's Dictionary

 

pilaster

 noun
noun
BrE BrE//pɪˈlæstə(r)//
 
; NAmE NAmE//pɪˈlæstər//
 
(specialist)
 
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a flat column that sticks out from the wall of a building, used as decoration Word Origin late 16th cent.: from French pilastre, from Italian pilastro or medieval Latin pilastrum, from Latin pila ‘pillar’.
See the Oxford Advanced American Dictionary entry: pilaster