principal point

noun

Medical Definition of principal point

: either of two points on the principal axis of a lens where the object and image have the same size and are not inverted in relation to each other

Learn More about principal point

Cite this Entry

“Principal point.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/principal%20point. Accessed 28 Oct. 2020.

Comments on principal point

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

WORD OF THE DAY

Test Your Vocabulary

Namesakes Word Quiz

  • a citrus fruit possibly named after a person
  • Which of the following is a fruit named after a Moroccan seaport?
Spell It

Can you spell these 10 commonly misspelled words?

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!