noun Physical Chemistry.
the visible path of light produced by the scattering action (Tyndall effect) of the particles in a colloidal solution on a beam of light passed through it.
The Origin Of Dog DaysThe exact dates of the dog days depend on your latitude, but by today’s estimation they begin on July 3 and come to a close on August 11.
Origin of Tyndall beam
named after J. Tyndall
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019