from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun An orange tree (Citrus aurantium) that is widely cultivated in warm regions and has reddish-orange, highly acidic fruit.
  • noun The fruit of this tree.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A citrus tree of the species Citrus aurantium.
  • noun Fruit of the species Citrus aurantium.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun highly acidic orange used especially in marmalade
  • noun any of various common orange trees yielding sour or bitter fruit; used as grafting stock


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