Artificial intelligent assistant

pillow-case

ˈpillow-case
  The washable case or covering, usually of white linen or cotton cloth, which is drawn over a pillow.

a 1745 Swift Direct. Servants viii, When you put a clean pillow-case on your lady's pillow. 1857 Wood Com. Obj. Sea Shore 57 The general shape of the egg [of the dog-fish] has been aptly compared to a pillow-case, with strings tied to the corners. 1869 E. A. Parkes Pract. Hygiene (ed. 3) 496 The use of bedding (pillows and pillow-cases).

Oxford English Dictionary

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