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rudderfish

[ruhd-er-fish]
See more synonyms for rudderfish on Thesaurus.com
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