follow Dictionary.com

What is the X in X-mas?

plane of incidence

noun, Optics.
1.
a plane determined by a given ray, incident on a surface, and the normal at the point where the incident ray strikes the surface.
Origin
1825-1835
1825-35
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source

Word of the Day

Difficulty index for plane of incidence

Few English speakers likely know this word

Word Value for plane

7
10
Scrabble Words With Friends

Quotes with plane-incidence