Noun
A liliaceous plant of the genus Allium (A. cepa), having a strong-flavored bulb and long hollow leaves; also, its bulbous root, much used as an article of food. The name is often extended to other species of the genus.
Source: Webster's dictionaryAn onion can make people cry, but there has never been a vegetable invented to make them laugh. Will Rogers
Let first the onion flourish there, Rose among the roots, the maiden-fair Wine scented and poetic soul of the capacious salad bowl. Robert Louis Stevenson
Acting is like peeling an onion. You have to peel away each layer to reveal another. Juliette Binoche
Onion treats seven ailments. Russian Proverb
Give even an onion graciously. Afghan Proverb
A cat has nine lives, as the onion seven skins. German Proverb