Dictionary

focal plane

noun

Definition of FOCAL PLANE

:  a plane that is perpendicular to the axis of a lens or mirror and passes through the focus

First Known Use of FOCAL PLANE

1889
Medical Dictionary

focal plane

noun

Medical Definition of FOCAL PLANE

:  a plane that is perpendicular to the axis of a lens or mirror and passes through the focus

Browse

2 ENTRIES FOUND:
Next Word in the Dictionary: focal–plane shutterPrevious Word in the Dictionary: focal lengthAll Words Near: focal plane
July 04, 2015
stringent Hear it
rigorous, strict, or severe
Take a 3-minute break and test your skills!
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears