A type of fish (likely a trunkfish or similar box-shaped fish) with a hard, box-like body structure.
Compound of 'coffer' (Old French cofre, meaning box/chest) and 'fish' (from Old English fisc). The name describes the fish's characteristic compact, box-like body shape.
Trunkfish and their relatives are called cofferfish because their bodies are literally enclosed in a rigid box of armor-like scales—they're one of nature's most literally box-shaped creatures!
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