MeSH definition : Placing of a hydroxyl group on a compound in a position where one did not exist before.
(Stedman, 26th ed);
MeSH synonym : hydroxylations;
MeSH annotation : almost never IM; enzymatic hydroxylation: coord NIM with MIXED FUNCTION OXYGENASES
(IM) substrate (NIM) or specific hydroxylase (IM);
Wikipedia link : https://en.wikipedia.org/wiki/Hydroxylation;