photometer

noun
pho·​tom·​e·​ter | \ fō-ˈtä-mə-tər How to pronounce photometer (audio) \

Definition of photometer

: an instrument for measuring luminous intensity, luminous flux, illumination, or brightness

First Known Use of photometer

1779, in the meaning defined above

History and Etymology for photometer

New Latin photometrum, from phot- + -metrum -meter

Keep scrolling for more

Learn More about photometer

Statistics for photometer

Look-up Popularity

Time Traveler for photometer

The first known use of photometer was in 1779

See more words from the same year

Keep scrolling for more

More Definitions for photometer

photometer

noun
pho·​tom·​e·​ter | \ fō-ˈtäm-ət-ər How to pronounce photometer (audio) \

Medical Definition of photometer

 (Entry 1 of 2)

: an instrument for measuring the intensity of light, luminous flux, illumination or brightness by comparison of two unequal lights from different sources usually by reducing the illumination of one (as by varying the distance of the source or using a polarizing device) until the two lights appear equal with the amount of adjustment serving as the basis of comparison and the equality of illumination being judged by various means

photometer

transitive verb

Medical Definition of photometer (Entry 2 of 2)

: to examine with a photometer

More from Merriam-Webster on photometer

Rhyming Dictionary: Words that rhyme with photometer

Britannica.com: Encyclopedia article about photometer

Comments on photometer

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

WORD OF THE DAY

tired or exhausted

Get Word of the Day daily email!

Test Your Vocabulary

Where in the World? A Quiz

  • peter bruegel tower of babel painting
  • What language does pajama come from?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Bee Cubed

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!