Definition of pillowcase noun from the Oxford Advanced American Dictionary

 

pillowcase

 noun
noun
NAmE//ˈpɪloʊˌkeɪs//
 
(also pillowslip
NAmE//ˈpɪloʊˌslɪp//
 
)
 
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a cloth cover for a pillow, that can be removed
See the Oxford Advanced Learner's Dictionary entry: pillowcase