onion

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Concise Oxford English Dictionary © 2008 Oxford University Press:
onion/ˈʌnjən/
noun
  • 1 an edible bulb used as a vegetable, having a pungent taste and smell and composed of several concentric layers.
  • 2 the plant that produces the onion, with spherical heads of greenish-white flowers. [Allium cepa.]
– phrases
know one's onions informal be very knowledgeable.
– derivatives
oniony adjective.
– origin ME: from OFr. oignon, based on L. unio(n-), denoting a kind of onion.
'onion' also found in these Oxford entries:

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