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

  • adj. Migrating up rivers from the sea to breed in fresh water. Used of fish.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. That lives in the sea and breeds in fresh water.
  • adj. Of a fern in which the first veins in a frond segment are produced towards the apex of the frond.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Ascending rivers from the sea, at certain seasons, for breeding, as the salmon, shad, etc.
  • adj. Tending upwards; -- said of terns in which the lowest secondary segments are on the upper side of the branch of the central stem.

from The Century Dictionary and Cyclopedia

  • Ascending.
  • In botany, to ferns whose lowest secondary branches originate on the anterior side of the pinuæ.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

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


From Greek anadromos, running up : ana-, ana- + dromos, a running.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek ἀνάδρομος, from ἀνά ("up") + δρόμοs ("running"). (Wiktionary)



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  • Thanks, michaelt42--I just added finnock to my trout list.

    April 12, 2012

  • Sea trout in the British Isles, which is anadromous in spawning behavior, is also known according to region as sewin in Wales, finnock (Scotland), peal (West Country), mort (North West England) and white trout (Ireland). It is the entry of the fry into the sea that governs the growth and subsequent spawning of this fish, which is genetically identical with brown trout.

    April 12, 2012