backarc From WikiWord, the free dictionary English Contents DefinitionsRelated wordsReferences DefinitionsnounThe landward region of a volcanic chain, opposite the subduction zone. Related wordsSynonymsforearcsubarcticsubarchanticenterarcharetearcadicvolcanabyssarchicontinentpalaeosubductiontoarcianbad landsupper boundaryarcadiaorogenous zone References Wiktionary — backarc Wikipedia — backarc