[ˈʌnjən], (Noun)

Definitions:
- a swollen edible bulb used as a vegetable, having a pungent taste and smell and composed of several concentric layers
(e.g: cook the onion in the oil until lightly coloured)

- the plant that produces the onion, with long rolled or straplike leaves and spherical heads of greenish-white flowers


Phrases:
- know one's onions

Origin:
Middle English: from Old French oignon, based on Latin unio(n-), denoting a kind of onion