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Definition of: onion
Our photo definition of Onion 
Our photo definition of onion 
(un′yən) noun
1. A field-grown edible bulb of an herb (Allium cepa) of the lily family; a succulent vegetable remarkable for its pungent odor and taste.
2. One of various allied plants. [<OF oignon <L unio, -onis unity, a pearl, an onion. Doublet of UNION.]
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