n.

1. 【气】气旋[U]
   Tropical low pressure fronts easily become cyclone, which are called typhoons or hurricanes depending on the location.

   热带的低气压容易形成气旋，而依地区的不同称之为台风或飓风。

2. 旋风；暴风；龙卷风[C]

n.

1. Meteorology  a system of winds rotating inwards to an area of low barometric pressure; a depression.
2. a tropical storm.