ni‧trate /ˈnaɪtreɪt, -trət/ 
 noun [uncountable and countable][
Date: 1700-1800; 
Language: French; 
Origin: nitrique;  ⇒ nitric acid]
 used in the name of substances containing 
nitrogen and 
oxygen. Nitrates are often used to improve soil: 
 potassium nitrate
 potassium nitrate high levels of nitrates in drinking water
 high levels of nitrates in drinking water  [TahlilGaran] Dictionary of Contemporary English ▲