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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. The fruit of an oak, consisting of a single-seeded, thick-walled nut set in a woody, cuplike base.

Century Dictionary and Cyclopedia

  1. n. The fruit of the oak; a one-celled, one-seeded, coriaceous, rounded or elongated nut, the base of which is surrounded by an indurated scaly cup. Acorns have been used for food, and are still eaten in various countries. The sweet acorn is the fruit of the Quercus Ballota of northwestern Africa, and is quite palatable, as are also several American species. All are excellent food for swine.
  2. n. Nautical, a small ornamental piece of wood, of a conical or globular shape, sometimes fixed on the point of the spindle above the vane, on a masthead, to keep the vane from being blown off.
  3. n. Any similar ornamental tip.
  4. n. Same as acorn-shell, 2.

Wiktionary

  1. n. The fruit of the oak, being an oval nut growing in a woody cup or cupule.
  2. n. A cone-shaped piece of wood on the point of the spindle above the vane, on the mast-head.
  3. n. See acorn-shell.

GNU Webster's 1913

  1. n. The fruit of the oak, being an oval nut growing in a woody cup or cupule.
  2. n. A cone-shaped piece of wood on the point of the spindle above the vane, on the mast-head.
  3. n. See Acorn-shell.

WordNet 3.0

  1. n. fruit of the oak tree: a smooth thin-walled nut in a woody cup-shaped base

Etymologies

  1. Middle English akorn, from Old English æcern.

Examples

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‘acorn’ has been looked up 1895 times, loved by 1 person, added to 30 lists, commented on 4 times, and has a Scrabble score of 7.