Definition of "lewisite" [lewisite]

• An oily, colorless to violet or brown liquid, C2H2AsCl3, used to make a highly toxic gas weapon. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Conant had supervised the production of a poison gas (never used) called lewisite during World War I, and shortly after the outbreak of World War II, he was invited to join a government body created to oversee scientific contributions to military research."
• "The corps found an open flask containing traces of the chemical agent mustard, another blistering agent called lewisite and munition shells with more digging near a one-time Army chemical warfare station at American University."
• "The Corps discovered an open flask containing traces of the chemical agent mustard, another blistering agent called lewisite and munition shells with more digging near a one-time Army chemical warfare station at American University."