tropical depression

tropical depression

noun Meteorology.
an atmospheric low-pressure system originating in the tropics, specifically, a tropical cyclone in which the maximum sustained wind speed is 38 miles per hour (62 kilometers per hour) or less.

Origin:
tropical + depression (def 13)

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Collins
World English Dictionary
tropical depression
 
n
(Caribbean) an area of heavy rains and winds, the first stage in the development of a possible hurricane

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Dictionary.com's 21st Century Lexicon
Main Entry:  tropical depression
Part of Speech:  n
Definition:  a cyclone in a tropical region that is more intense than a disturbance but less than a storm, with wind speeds of 38 mph or less
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American Heritage
Science Dictionary
tropical depression  
A tropical cyclone having sustained surface winds less than 39 mi (63 km) per hour. See Note at cyclone.
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