| Doppler, Christian Johann 1803-1853. Austrian physicist and mathematician who first enunciated the principle known as the Doppler effect in 1842. |
| Doppler (dŏp'lər) Pronunciation Key
Austrian physicist and astronomer who in 1842 explained the effect, now named for him, of variations in the frequency of waves as a result of the relative motion of the wave source with respect to the observer. |