noun

• A toxic yellow substance reported as falling in Southeast Asia, alleged to be a chemical warfare agent but now believed to consist of contaminated bee droppings.

  ‘Reports in the 1970s of Yellow Rain, alleged chemical/toxin weapons attacks in Southeast Asia and Afghanistan, sparked the first large-scale investigation conducted by the United States into allegations of chemical and biological weapons (CBW) use.’

  More example sentences

  • ‘The debate goes on for some time until an alternative explanation for the Yellow rain was presented, namely bee droppings.’