A type of flathead catfish or other fish with a rounded, blunt head; also historically used as an insult for a stupid person.
Compound of 'blunt' and 'head,' literally describing the physical shape. The animal name dates to 17th-century naturalist descriptions, while the insult usage is much older.
Catfish called 'blunthead' are actually incredibly successful predators despite their ungainly appearance—their flat head design lets them detect electrical signals in murky water better than pointy-headed fish can.
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