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.

Nearby words

  1. tropical acne,
  2. tropical anemia,
  3. tropical aquarium,
  4. tropical bubo,
  5. tropical cyclone,
  6. tropical diarrhea,
  7. tropical disturbance,
  8. tropical eosinophilia,
  9. tropical fish,
  10. tropical lichen

Origin of tropical depression

1845–50; tropical + depression (in the sense “(low atmospheric pressure”) Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for tropical depression

tropical depression


Caribbean an area of heavy rains and winds, the first stage in the development of a possible hurricane
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Science definitions for tropical depression

tropical depression

A tropical cyclone having sustained surface winds less than 39 mi (63 km) per hour. See Note at cyclone.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.