WordReference Random House Unabridged Dictionary of American English © 2025
Ray′leigh disk′, Acoustics, Mech.
- a small circular disk, usually of mica, that is suspended from a fiber and tends to be deflected at right angles to a stream of air, indicating by its deflection the intensity of a sound wave.
- named after J. west, western. south, southern. Rayleigh 1910–15