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miller's-thumb

[mil-erz-thuhm]
noun
  1. any of several small, freshwater sculpins of the genus Cottus, of Europe and North America.
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Origin of miller's-thumb

1400–50; late Middle English milneres thume; the fish is so called from its thumblike head
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018