Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Any of various deep-water fishes of the family Trachichthyidae, having mucus-filled cavities in the head and rough scales, and including the orange roughy.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The orange roughy, Hoplostethus atlanticus.
  • noun Australia Any of several marine fish of the related genus Trachichthys, which have rough and spiny scales.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Sense 1, probably from rough.]

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