heliometer

noun
he·​li·​om·​e·​ter | \ ˌhē-lē-ˈä-mə-tər How to pronounce heliometer (audio) \

Definition of heliometer

: a visual telescope that has a divided objective designed for measuring the apparent diameter of the sun but also used for measuring angles between celestial bodies or between points on the moon

Other Words from heliometer

heliometric \ ˌhē-​lē-​ō-​ˈme-​trik How to pronounce heliometer (audio) \ adjective
heliometrically \ ˌhē-​lē-​ō-​ˈme-​tri-​k(ə-​)lē How to pronounce heliometer (audio) \ adverb

First Known Use of heliometer

1753, in the meaning defined above

History and Etymology for heliometer

French héliomètre, from hélio- heli- entry 1 + -mètre -meter

Keep scrolling for more

Learn More About heliometer

Time Traveler for heliometer

Time Traveler

The first known use of heliometer was in 1753

See more words from the same year

Dictionary Entries Near heliometer

Heliolitidae

heliometer

heliometry

See More Nearby Entries 

Statistics for heliometer

Cite this Entry

“Heliometer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/heliometer. Accessed 26 Sep. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More from Merriam-Webster on heliometer

Britannica.com: Encyclopedia article about heliometer

WORD OF THE DAY

Test Your Vocabulary

Difficult Spelling Words Quiz

  • alphabet pasta spelling help
  • Which is the correct spelling?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

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!