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

1840, in the meaning defined above

Keep scrolling for more

Learn More about focal plane

Share focal plane

Statistics for focal plane

Look-up Popularity

Time Traveler for focal plane

The first known use of focal plane was in 1840

See more words from the same year

Keep scrolling for more

More Definitions for focal plane

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

More from Merriam-Webster on focal plane

See words that rhyme with focal plane

Comments on focal plane

What made you want to look up focal plane? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

a state of commotion or excitement

Get Word of the Day daily email!

Test Your Vocabulary

Words from Greek and Roman Mythology Quiz

  • the-triumph-of-venus-by-alessandro-magnasco
  • Boreal comes from the name of the ancient Greek god of which wind?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!