sergeant major
noun
plural sergeants major or sergeant majors
1
: a noncommissioned officer in the army or marine corps serving as chief administrative assistant in a headquarters
2
: a noncommissioned officer in the marine corps ranking above a first sergeant
3
: 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
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Merriam-Webster unabridged
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