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bonnethead

[bon-it-hed]
noun
  1. a hammerhead shark, Sphyrna tiburo, found in shallow waters from Brazil to Massachusetts, having a spade-shaped head.
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Origin of bonnethead

An Americanism dating back to 1875–80; bonnet + head
Also called bonnet shark, shovelhead.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018