monsoon
mon-SOON
A seasonal reversal of prevailing winds, most dramatically in South and Southeast Asia, where the summer monsoon brings months of heavy rain from the Indian Ocean and the winter monsoon brings dry air from the continent. The word has come to mean the rains themselves, but it is properly a wind — a wind that changes its mind twice a year.
Etymology
From Arabic mawsim, meaning "season" or "appropriate time," via Portuguese monção. Arab sailors named it for the seasonal timing that governed their trade routes across the Indian Ocean.
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