Definition of onion

Definition of onion
  1. onion Noun A monocotyledonous plant of genus "Allium" allied to garlic, used as vegetable and spice.
  2. onion Noun The bulb of such a plant.
  3. onion Noun The genus as a whole.
  4. onion Noun A ball.
  5. onion Noun A person from Bermuda or of Bermudian descent.
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