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Chemistry. of or referring to an isotope of higher than normal atomic excess weight, as heavy hydrogen or heavy oxygen, or to your compound containing these types of an element, as heavy drinking water.swaar, hewig بِتَثاقُل، بِصورَة ثقيلَه тежко pesadamente těžce schwer tungt; stærkt; voldsomt; stort; svært βαρι