Pronunciation: (mas'tur-ut-ärmz', mä'stur-), [key]
1. an officer of a fraternal organization, veterans' society, or the like, empowered to maintain order, exclude unauthorized persons, etc.
2. Navy.a petty officer who has various duties, such as keeping order on the ship, taking charge of prisoners, etc.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.