
1) Gas
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https://www.crosswordclues.com/clue/lewisite

==Chemical reactions== The compound is prepared by the addition of arsenic trichloride to acetylene in the presence of a suitable catalyst: Lewisite, like other arsenous chlorides, hydrolyses in water to form hydrochloric acid: This reaction is accelerated in alkaline solutions, with poisonous (but non-volatile) sodium arsenite being the coproduct...
Found on
http://en.wikipedia.org/wiki/Lewisite

in chemical warfare, poison blister gas developed by the United States for use during World War I. Chemically, the substance is ... [2 related articles]
Found on
http://www.britannica.com/eb/a-z/l/42

One of the more well-known blister agents, listed in Schedule 1.
Found on
http://www.chemicalglossary.net/definition/994-LEWISITE

C2H2AsCl3; dichloro(2-chlorovinyl)arsine;a war gas. It is a vesicant, a lung irritant like mustard gas, a systemic poison entering the circulation through the lungs or skin, and a mitotic poison arresting mitosis in the metaphase; dimercaprol is the antidote. ... Synonym: beta-chlorovinyldichloroarsine. ... Origin: W. Lee Lewis, U.S. Chemist 1898-1...
Found on
http://www.encyclo.co.uk/local/20973

Type: Term Pronunciation: lū′i-sīt Definitions: 1. A toxic gas used in warfare. It is a vesicant, a lung irritant like mustard gas; a systemic poison entering the circulation through the lungs or skin, and a mitotic poison arresting mitosis in the metaphase; dimercaprol is the antidote.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=49265

Lewisite is a blister gas used in chemical warfare. It is a dark oily liquid smelling of geraniums. It attacks the victim immediately, causing blisters and acting as a systematic poison causing pulmonary oedema, diarrhoea, low blood pressure and subnormal temperature.
Found on
http://www.probertencyclopaedia.com/browse/FL.HTM
No exact match found.