Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of a consistent system of prevailing winds occupying most of the tropics, constituting the major component of the general circulation of the atmosphere, and blowing northeasterly in the Northern Hemisphere and southeasterly in the Southern Hemisphere. Often used in the plural.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A steady wind that blows from east to west above and below the equator.

from the GNU version of the Collaborative International Dictionary of English

  • n. a wind in the torrid zone, and often a little beyond at, which blows from the same quarter throughout the year, except when affected by local causes; -- so called because of its usefulness to navigators, and hence to trade.

from The Century Dictionary and Cyclopedia

  • n. A wind that blows in a regular trade or course—that is, continually in the same direction.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. steady winds blowing from east to west above and below the equator

Etymologies

From obsolete to blow trade, to blow in a regular course, from trade, regular course (obsolete).
(American Heritage® Dictionary of the English Language, Fourth Edition)

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