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ad lib
ad-lib
ad libitum
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adamsite

ad·ams·ite [ áddəmz t ]


noun 
Definition:
 
poisonous gas: a gas containing arsenic used in chemical warfare in World War I, causing severe irritation to the lungs, nose, and eyes and inducing sneezing, vomiting, and nausea

[Mid-20th century. After the U.S. military chemist Robert Adams, who studied it after World War I]
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