A toxic chemical compound containing ethyl, chlorine, and arsenic groups, historically used as a chemical warfare agent.
From ethyl + dichloro- (two chlorine atoms) + arsine (arsenic compound); named for its chemical composition.
Ethyldichloroarsine was one of the first chemical weapons synthesized, causing severe blistering and respiratory damage—it's why international chemical weapons treaties specifically mention arsenical compounds, making chemistry's dark history tangible.
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