a waterproof or water-repellent coat worn as protection against rain.

1820–30, Americanism; rain + coat

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World English Dictionary
raincoat (ˈreɪnˌkəʊt)
a coat made of a waterproof material

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica


waterproof outercoat or raincoat, named after a Scottish chemist, Charles Macintosh (1766-1843), who invented the waterproof material that bears his name. The fabric used for a mackintosh was made waterproof by cementing two thicknesses of it together with rubber dissolved in a coal-tar naphtha solution

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Rain is common throughout all regions during this month, so a good raincoat or
  umbrella recommended.
Rain is consistent throughout the year, making it necessary to pack an umbrella
  or raincoat.
The raincoat is a trench coat style and is red with pink polka-dots.
When wearing a raincoat, the plastic combination cap rain cover clear may be
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