master-at-arms

from WordNet (r) 3.0 (2006)
master-at-arms
    n 1: the senior petty officer; responsible for discipline aboard
         ship
from The Collaborative International Dictionary of English v.0.48
master-at-arms \master-at-arms\ n. (Naut.)
   The senior petty officer of a ship, responsible for
   discipline aboard the ship.
   [WordNet 1.5]
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