Meaning of Rayleigh scattering

Ray'leigh scat"tering

Pronunciation: [key]
— Optics. Optics.
  1. the scattering of light by particles that are very small in relation to the wavelength of the light, and in which the intensity of the scattered light varies inversely with the fourth power of the wavelength. Cf.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.