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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. adj. Living in fresh water but migrating to marine waters to breed. Used of fish.

Century Dictionary and Cyclopedia

  1. Running down; descending: applied to certain fishes which descend streams to the sea to spawn: opposed to anadromous.
  2. In botany, having the first set of nerves (in each segment of a fern frond) given off on the basal side of the midrib, as in Osmunda. Compare anadromous .

Wiktionary

  1. adj. that lives in fresh water and breeds in the sea
  2. adj. Of a fern in which the first veins in a frond segment are produced towards the base of the frond.

GNU Webster's 1913

  1. adj. Having the lowest inferior segment of a pinna nearer the rachis than the lowest superior one; -- said of a mode of branching in ferns, and opposed to anadromous.
  2. adj. Living in fresh water, and going to the sea to spawn; -- opposed to anadromous, and said of the eel.

WordNet 3.0

  1. adj. migrating from fresh water to the sea to spawn

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‘catadromous’ has been looked up 885 times, added to 12 lists, and has a Scrabble score of 16.