
1) German invention
Found on
https://www.crosswordclues.com/clue/adamsite

Diphenylaminechlorarsine | Section1 = {Chembox Identifiers | Abbreviations = DM | CASNo = 578-94-9 | CASNo_Ref = {{cascite|changed|??} | PubChem = 11362 | PubChem_Ref = {Pubchemcite|correct|PubChem} | ChemSpiderID = 10884 | ChemSpiderID_Ref = {chemspidercite|correct|chemspider} | EINECS = 209-433-1 | MeSHName = Phenarsazine+chloride | SMILES = Cl[...
Found on
http://en.wikipedia.org/wiki/Adamsite

in chemical warfare, sneeze gas developed by the United States and used during World War I. Adamsite is an arsenical diphenylaminechlorarsine and an ...
Found on
http://www.britannica.com/eb/a-z/a/17

A vomiting agent that has been used in military training and in riot control. ... Origin: Roger Adams, Am. Chemist ... (05 Mar 2000) ...
Found on
http://www.encyclo.co.uk/local/20973

(ad´әmz-īt) phenarsazine chloride.
Found on
http://www.encyclo.co.uk/local/21001

Adamsite is a vomiting gas used in chemical warfare. It is a yellow to green odourless solid which causes irritation of the eyes and mucous membranes, followed by a viscous discharge from the nose, sneezing, coughing, severe headache, acute pains and tightness of the chest followed by nausea and vomiting.
Found on
http://www.probertencyclopaedia.com/browse/FA.HTM

a yellow irritant smoke, containing a poisonous form of arsenic and used as a harassing agent. Also called
Found on
https://www.infoplease.com/dictionary/adamsite
No exact match found.