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[uh-nad-ruh-muh s] /əˈnæd rə məs/
(of fish) migrating from salt water to spawn in fresh water, as salmon of the genera Salmo and Oncorhynchus (distinguished from catadromous).
Origin of anadromous
1745-55; < Greek anádromos running upward. See ana-, -drome, -ous Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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British Dictionary definitions for anadromous


(of fishes such as the salmon) migrating up rivers from the sea in order to breed Compare catadromous
Word Origin
C18: from Greek anadromos running upwards, from ana- + dromos a running
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for anadromous

of fish, "ascending a river to spawn" (as salmon do), 1753, from Latinized form of Greek anadromos "running upward," from ana "up, back" (see ana-) + dramein "to run" (see dromedary).

Online Etymology Dictionary, © 2010 Douglas Harper
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anadromous in Science
Relating to fish, such as salmon or shad, that migrate up rivers from the sea to breed in fresh water.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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