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| a progressive disturbance propagated in a medium without progress or advance by the points themselves, as in the transmission of sound or light |
| the amount of heat per unit time per area that can be conducted through a plate of thickness of a given material, differing by one unit of temperature |
| wave theory | |
| —n | |
| 1. | the theory proposed by Huygens that light is transmitted by waves |
| 2. | See electromagnetic wave any theory that light or other radiation is transmitted as waves |