sergeant major

  1. the chief administrative noncommissioned officer in a military headquarters: an occupational title and not a rank
  2. U.S. Army, U.S. Marine Corps the highest ranking noncommissioned officer
  3. a small damselfish (Abudefduf saxatilis) with several dark, wide, vertical stripes on its bright-yellowish upper body

See sergeant major in American Heritage Dictionary 4

noun pl. sergeants major sergeants major or sergeant majors
  1. a. Abbr. SGM or SgtMaj Used as a title for a noncommissioned officer serving as chief administrative assistant of a headquarters unit of the U.S. Army or Marine Corps.
    b. One who holds this title.
  2. Chiefly British A noncommissioned or warrant officer of the highest rank in a company or unit of battalion size.
  3. A small damselfish (Abudefduf saxatilis) of warm seas, having a flattened body with dark vertical stripes. Also called cow pilot.
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