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noun, plural (especially collectively) weath·er·fish, (especially referring to two or more kinds or species) weath·er·fish·es.
  1. any of several loaches of the genus Misgurnus, especially the European M. fossilis, which shows increased activity in response to changes in barometric pressure.

Origin of weatherfish

First recorded in 1885–90; weather + fish
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018