the GNU version of the Collaborative International Dictionary of English
n. One who admonishes.
The Century Dictionary and Cyclopedia
n. One who reproves or counsels.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. someone who gives a warning so that a mistake can be avoided
Word Usage
""Although I think [outgoing trust chairman] Sir Michael Lyons has done as well as he possibly could, it's very difficult, being an advocate, regulator and admonisher," he said."