| rad | the minute pressure exerted on a surface normal to the direction of propagation of a wave |
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| rad | a pyrometer for estimating the temperature of distant sources of heat |
| rad | syndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions) |
| rad | syndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions) |
| rad | (medicine) the treatment of disease (especially cancer) by exposure to radiation from a radioactive substance |
| rad | a mechanism consisting of a metal honeycomb through which hot fluids circulate |
| rad | heater consisting of a series of pipes for circulating steam or hot water to heat rooms or buildings |
| rad | any object that radiates energy |
| rad | cap on the opening in the top of a radiator through which a coolant liquid can be added |
| rad | grating that admits cooling air to car's radiator |
| rad | a flexible hose between the radiator and the engine block |
| rad | (linguistics) the form of a word after all affixes are removed |