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rudderfish

[ruhd-er-fish]
noun, plural (especially collectively) rud·der·fish, (especially referring to two or more kinds or species) rud·der·fish·es.
  1. any of various fishes having the habit of following behind ships, as a pilot fish.
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Origin of rudderfish

First recorded in 1725–35; rudder + fish
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018