dispersive medium

noun

1. physics a substance in which waves of different frequencies travel at different speeds

Example Sentences

If you send light produced in this way through a dispersive medium, Einstein predicted, the wave fronts should be deflected if the emission process were classical.

From Scientific American

Thus the ether within the dispersive medium is loaded with molecules which are forced to perform oscillations of the same period as that of the transmitted wave.

From Project Gutenberg