yellow rain

noun
small, powdery yellow deposits containing the fungal toxin tricothecene, found on leaves and other surfaces in Southeast Asia and Afghanistan in the early 1980s and alleged by some to be a chemical weapon disseminated by air but claimed by others to be pollen-containing bee excrement contaminated by fungus.

Origin:
1975–80

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World English Dictionary
yellow rain
 
n
a type of yellow precipitation described in parts of SE Asia and alleged by some to be evidence of chemical warfare using mycotoxins

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Britannica
Encyclopedia

yellow rain

airborne substance that was alleged to have been used in biological attacks in Southeast Asia from the mid-1970s to the mid-1980s.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Lily's pen, all the rain in the universe dripping from the brim of my silly yellow rain.
In inclement weather, employees wore standard yellow rain gear.
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