eroding ero·ding US/iˈroʊdɪŋ/ rare noun 1. (geology) the mechanical process of wearing or grinding something down (as by particles washing over it) Synonymserosioneating awaywearingwearing away Related words Word family wear awayerode Broader terms geological process Narrower terms chatter markablationabrasionbeach erosiondeflationplanationsoil erosion WordNet 2.1 (Princeton University). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.