fitted sheet

/F IH1 T AH0 D SH IY1 T/
noun
  1. 1

    A sheet tailored to form pocket for a mattress with elastic edges that is suitable for a range of mattress sizes. The edge may also contain a drawstring to secure the sheet more firmly and enable use on a wider range of mattress thicknesses.

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Source: https://en.wiktionary.org/wiki/fitted%20sheet