onion
/ˈʌnjən/noun
1
- a swollen edible bulb with a pungent taste and smell, composed of several concentric layers, used in cooking as a vegetable and flavouring洋葱（头）。
2
- the plant that produces this bulb, with long rolled or strap-like leaves and spherical heads of greenish-white flowers洋葱。
2.1
- Allium cepa, family Liliaceae (or Alliaceae).拉丁名Allium cepa,百合科（或葱科）。
短语
know one's onions
- informal be very knowledgeable about something〈非正式〉（在某方面）知识渊博的。
派生词
oniony
adjective词源
Middle English: from Old French oignon, based on Latin unio（n-）, denoting a kind of onion.