Part of speech: noun

A board or slab set horizontally into or against a wall.

Part of speech: noun

A flat projecting ledge of rock; a reef; shoal.

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Usage examples "shelf":

  1. Probably Ken had found something interesting to keep him from noticing the alarm clock on a shelf in the laboratory. - "The Year When Stardust Fell", Raymond F. Jones.
  2. You are on the shelf. - "Ted and the Telephone", Sara Ware Bassett.
  3. Now go and get me that green book on the third shelf and I'll read to you for a while, if you want. - "The Whirligig of Time", Wayland Wells Williams.