Huygens' Principle Definition

hīgənz

noun

The principle that any point on a wave front of light may be regarded as the source of secondary waves and that the surface that is tangent to the secondary waves can be used to determine the future position of the wave front.

American Heritage

Origin of Huygens' Principle

From Christiaan Huygens, Dutch physicist.

From Wiktionary
After Christiaan Huygens

From American Heritage Dictionary of the English Language, 5th Edition