Sonorous figures

(Physics) figures formed by the vibrations of a substance capable of emitting a musical tone, as when the bow of a violin is drawn along the edge of a piece of glass or metal on which sand is strewed, and the sand arranges itself in figures according to the musical tone. Called also acoustic figures.

See also: Sonorous

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.