red onion

• Audio (US):

  (file)

red onion (plural red onions)

2. A type of onion with reddish purplish skin.
   • 1961, Harry E. Wedeck, Dictionary of Aphrodisiacs, New York: The Citadel Press, page 70:

     Marcus Empiricus, a Roma physician, prescribed three scruples of cress, three of red onion, three of pine seed, three of Indian nard, for impotence.

4. An instance of this type.