Welsh onion

noun

Definition of Welsh onion 

: an Asiatic onion (Allium fistulosum) with tufted glabrous foliage and slender bulbs that is sometimes cultivated for its leaves which are used in seasoning and its bulbs which are used as early green onions

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First Known Use of Welsh onion

1731, in the meaning defined above

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The first known use of Welsh onion was in 1731

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