aminopterin
noun
am·i·nop·ter·in ˌa-mə-ˈnäp-tə-rən 
: a derivative C19H20N8O5 of glutamic acid that is a folic acid antagonist and has been used as a rodenticide and antileukemic agent
Example Sentences
Recent Examples on the Web In the late 1940s, legendary cancer researcher Sydney Farber and colleagues reported successfully treating acute leukemia in children with a new drug called aminopterin. 
Gwen Nichols, STAT, 30 Dec. 2019 In 1947 aminopterin, a chemical which messes up cell division by interrupting the metabolism of folic acid, was found to produce remissions in children with acute leukaemia. The Economist, 14 Sep. 2017
Gwen Nichols, STAT, 30 Dec. 2019 In 1947 aminopterin, a chemical which messes up cell division by interrupting the metabolism of folic acid, was found to produce remissions in children with acute leukaemia. The Economist, 14 Sep. 2017 Word History
Etymology
amino + pteroylglutamic acid + -in
First Known Use
1948, in the meaning defined above
Medical Definition
aminopterin
noun
am·i·nop·ter·in ˌam-ə-ˈnäp-tə-rən
: a derivative C19H20N8O5 of glutamic acid that is a folic acid antagonist and has been used as a rodenticide and antileukemic agent