Master-at-arms
[mas-ter-uh t-ahrmz, mah-ster-] /ˈmæs tər ətˈɑrmz, ˈmɑ stər-/
noun, plural masters-at-arms.
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.
noun (pl) masters-at-arms
1.
the senior rating, of Chief Petty Officer rank, in a naval unit responsible for discipline, administration, and police duties
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