green onion
US /ˌɡriːn ˈʌn.jən/
UK /ˌɡriːn ˈʌn.jən/

1.
a young onion, especially one that has a small white bulb and long green leaves and is eaten raw
:
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Chop the green onions finely for the salad.
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Garnish the soup with fresh, chopped green onions.