пододеяльник

Noun

 * 1) blanket cover, quilt cover, duvet cover, etc.; generally, an envelope of bedsheet fabric that encloses a blanket, duvet, or doona; historically, a type of sheet that attached to a blanket or duvet from below

Usage notes

 * The usual set of Russian bed linens consists of (covering the mattress),  (enclosing the pillow), and  (enclosing the blanket).