Definitions

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

  • n. A herbicide containing trace amounts of the toxic contaminant dioxin that was used in the Vietnam War to defoliate areas of forest.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • proper n. a herbicide and defoliant used by US forces in Vietnam.

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

  • n. a herbicide used in the Vietnam War to defoliate forest areas

Etymologies

From the orange identifying strip on drums in which it was stored.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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