SERGEANT MAJOR

noun (plural sergeants major or ~s) Date: 1797 a noncommissioned officer in the army or marine corps serving as chief administrative assistant in a headquarters, a noncommissioned officer in the marine corps ranking above a first sergeant, a bluish-green to yellow bony fish ( Abudefduf saxatilis of the family Pomacentridae) with black vertical stripes on the sides that is widely distributed in the western tropical Atlantic Ocean