ボックスシーツ

noun

fitted sheet; box sheet

A sheet with elasticated corners designed to fit snugly over a mattress. The term 'box sheet' is a direct loan from English but less common than 'fitted sheet' in English-speaking countries.

• 新あたらしいボックスシーツを買かったので、ベッドにぴったりフィットした。

  I bought a new fitted sheet, and it fits the bed perfectly.

• このボックスシーツは洗せん濯たくしても縮ちぢまない。

  This fitted sheet doesn't shrink even after washing.