n.
Pronunciation: ˌ a-m ə - ' näp-t ə -r ə n
Function: noun
Etymology: amino + pter oylglutamic acid + -in
Date: 1948
: a derivative C 19 H 20 N 8 O 5 of glutamic acid that is a folic acid antagonist and has been used as a rodenticide and antileukemic agent