bulb/bʌlb/

n.

➊ the glass part of an electric light

➋ a round root that grows into a plant

n. [C]

➊ 灯泡：a 40 watt bulb 一个40瓦的灯泡

◇a light bulb 电灯泡

➋ 球茎：The size of the onion bulb is dependent upon the number and size of the green leaves. 洋葱球茎的大小取决于绿叶的数量和大小。