pillowcase

Từ điển Oxford Advanced Learner 8th

pil·low·case [pillowcase pillowcases] BrE [ˈpɪləʊkeɪs] NAmE [ˈpɪloʊkeɪs] (also ˈpil·low·slip BrE [ˈpɪləʊslɪp] ; NAmE [ˈpɪloʊslɪp] ) noun
a cloth cover for a ↑pillow, that can be removed