proline
Concise Oxford English Dictionary © 2008 Oxford University Press:
proline /ˈprəʊliːn/
▶noun Biochemistry an amino acid which is a constituent of most proteins, especially collagen.
– origin early 20th cent.: contr. of the chemical name p(yr)rol(id)ine-2-carboxylic acid.
'proline' also found in these Oxford entries:

