nWelsh onionAsiatic onion with slender bulbs; used as early green onions
Webster's Revised Unabridged Dictionary
Welsh onion(Bot) a kind of onion (Allium fistulosum) having hollow inflated stalks and leaves, but scarcely any bulb, a native of Siberia. It is said to have been introduced from Germany, and is supposed to have derived its name from the German term wälsch foreign.
Welsh onion(Bot) See Cibol.
The Welsh Onion is a hardy perennial from Siberia.
"The Field and Garden Vegetables of America" by Fearing Burr