heavy hydrogen

isotope of hydrogen with atoms twice the normal weight 重氢.

heat-wave, heated, heatedly, heater, heath, Heath Robinson, heathen, heathenish, heather, heating, heatwave, heave, heaven, heaven-sent, heavenly, heavenward, heavily, heaviness, Heaviside layer, heavy, heavy industry, heavy water, heavy-duty, heavy-handed, heavy-handedly, heavy-handedness, heavy-hearted, heavy-laden, heavyweight, Hebraic, Hebrew, heck, heckle, heckler, hect(o)-, hectare, hectic, hectically, hectogram, hector,