a removable sacklike covering, usually of cotton, drawn over a pillow.
Also called pillowslip [pil-oh-slip] .

1715–25; pillow + case1

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World English Dictionary
pillowcase or pillowslip (ˈpɪləʊˌkeɪs, ˈpɪləʊˌslɪp)
a removable washable cover of cotton, linen, nylon, etc, for a pillow
pillowslip or pillowslip

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Example sentences
He took the wet lettuce, put it in a pillowcase and spun it dry.
The purpose of this research study is to better understand how this study
  pillowcase works when people use it to treat acne.
Place a pillowcase on the ironing surface for padding, and iron it to remove
  any wrinkles.
Make sure the pillowcase and ironing surface are completely smooth.
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