circulatory death, this is the irreversible loss of function of the heart and lungs after a cardiac arrest from which the patient cannot or should not be resuscitated
marwolaeth cylchred gwaed - pan fydd y galon a'r ysgyfaint yn peidio â gweithio ar ôl ataliad y galon, ac nad oes modd adfywio'r claf neu na ddylid gwneud hynny.