illuminant

noun
il·​lu·​mi·​nant | \ i-ˈlü-mə-nənt How to pronounce illuminant (audio) \

Definition of illuminant

: an illuminating device or substance

Keep scrolling for more

Synonyms for illuminant

Synonyms

Visit the Thesaurus for More 

Examples of illuminant in a Sentence

at the time, a spermaceti candle was the brightest indoor illuminant available
Recent Examples on the Web Distilling rock oil produced multiple interesting compounds, one of which looked like an ideal illuminant. Charles R. Morris, WSJ, "‘Energy’ Review: The Path to Power," 21 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'illuminant.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of illuminant

1644, in the meaning defined above

Keep scrolling for more

Learn More about illuminant

Time Traveler for illuminant

Time Traveler

The first known use of illuminant was in 1644

See more words from the same year

Statistics for illuminant

Cite this Entry

“Illuminant.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/illuminant. Accessed 22 Oct. 2020.

Keep scrolling for more

More Definitions for illuminant

illuminant

noun
il·​lu·​mi·​nant | \ -nənt How to pronounce illuminant (audio) \

Medical Definition of illuminant

: an illuminating device or substance (as for a microscope)

More from Merriam-Webster on illuminant

Thesaurus: All synonyms and antonyms for illuminant

Comments on illuminant

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

WORD OF THE DAY

Test Your Vocabulary

Farm Idioms Quiz

  • cow coming home
  • What does 'poke' refer to in the expression 'pig in a poke'?
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!