Search Result for "rayleigh disk":
Wordnet 3.0

NOUN (1)

1. an acoustic radiometer consisting of a light disk suspended from a quartz thread; when exposed to a progressive sound wave its torque can measure velocity; 



WordNet (r) 3.0 (2006):

Rayleigh disk
    n 1: an acoustic radiometer consisting of a light disk suspended
         from a quartz thread; when exposed to a progressive sound
         wave its torque can measure velocity