Migrating up rivers from the sea to breed in fresh water. Used of fish.
Going from salt water to fresh water or up rivers to spawn.
Webster's New World
Origin of Anadromous
From Ancient Greek ἀνάδρομος (anadromos), from ἀνά (ana, “up”) + δρόμοs (dromos, “running”).
From Greek anadromos running up ana- ana- dromos a running
From American Heritage Dictionary of the English Language, 5th Edition
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