n.[C]

1. 【植】球茎，鳞茎；鳞茎植物
2. 球状物；温度计的球部
3. 电灯泡
   The bulb has burned out.

   灯泡烧坏了。

4. 电子管

vi.

1. 生球茎
2. 膨胀成球状

n.

1. a rounded underground storage organ present in lilies and some other plants, consisting of a short stem surrounded by fleshy leaf bases and lying dormant over winter.
2. short for light bulb.
3. an expanded or rounded part at the end of something.
4. a hollow container from which air can be expelled by squeezing, used to fill a syringe, pipette, etc.