/ahr"jeuh neen', -nuyn', -nin/ , n. Biochem.
an essential amino acid, C 6 H 14 N 4 O 2 : the free amino acid increases insulin secretion and is converted to urea in the liver by arginase. Abbr.: Arg; Symbol: R
[ 1885-90; Arginin, a name unexplained by its originators ]