pillowcase
noun/ˈpɪləʊkeɪs/
/ˈpɪləʊkeɪs/
(also pillowslip
/ˈpɪləʊslɪp/
/ˈpɪləʊslɪp/
)- a cloth cover for a pillow, that can be removed
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pillowcase
Definition of pillowcase noun from the Oxford Advanced Learner's Dictionary