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

 

pillowcase

 noun
noun
BrE BrE//ˈpɪləʊkeɪs//
 
; NAmE NAmE//ˈpɪloʊkeɪs//
 
(also pillowslip
BrE BrE//ˈpɪləʊslɪp//
 
; NAmE NAmE//ˈpɪloʊslɪp//
 
)
 
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a cloth cover for a pillow, that can be removed
See the Oxford Advanced American Dictionary entry: pillowcase