One of the mysteries of the English language finally explained.
A large striped serranid food fish, Epinephelus striatus, found in the Caribbean Sea, Gulf of Mexico, and western Atlantic (from North Carolina to Brazil), and noted for its colour-changing ability.
Late 19th century; earliest use found in The Century Dictionary. From the name of Nassau, capital city of the Bahamas + grouper.
Nassau grouper/ˌnasɔː ˈɡruːpə/
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