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Agent Orange (n.)

powerful defoliant used by U.S. military in the Vietnam War, reported to have been used from 1961; so called from the color strip on the side of the container, which distinguished it from Agent Blue, Agent White, etc., other herbicides used by the U.S. military; see agent (n.). Banned from April 1970.

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Definitions of Agent Orange from WordNet

Agent Orange (n.)
a herbicide used in the Vietnam War to defoliate forest areas;
From wordnet.princeton.edu