lunar

adjective

lu·​nar ˈlü-nər How to pronounce lunar (audio)
also -ˌnär
1
: crescent, lunate
Who grasps the struggling heifer's lunar horns.Alexander Pope
2
a
: of, relating to, or resembling the moon
lunar craters
a lunar landscape
b
: designed for use on the moon
lunar vehicles
3
: measured by the moon's revolution
lunar month

Examples of lunar in a Sentence

Recent Examples on the Web
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That includes using a technique called atomic interferometry or quantum sensors to make measurements across the solar system, such as lunar laser ranging, or on wider astronomical scales such as measuring the dynamics of planets. Robert Lea, Space.com, 15 June 2026 If the main engines were to become inoperative, six smaller orbit-control thrusters can still be activated on the lunar surface, providing an alternative pathway for a rapid ascent. Bojan Stojkovski, Interesting Engineering, 14 June 2026 The company leveraged digital twin technology to iterate upon its existing designs and make a more compact lunar rover. Chris Young june 13, New Atlas, 13 June 2026 Also flying is the Lunar Trailblazer, a mission selected under NASA’s Small Innovative Missions for Planetary Exploration (SIMPLEx) program, a small satellite designed to provide an understanding of the form, abundance, and distribution of water on the moon, as well as the lunar water cycle. Richard Tribou, The Orlando Sentinel, 12 June 2026 See All Example Sentences for lunar

Word History

Etymology

Middle English lunare, borrowed from Latin lūnāris "of the moon, crescent-shaped," from lūna "moon" + -āris -ar; lūna going back to Indo-European *lou̯k-s-neh2, derivative of the verb stem *leu̯k- "become bright," whence also Old Church Slavic luna "moon," Russian luná, Old Prussian lauxnos "stars," Armenian lusin "moon"; from a stem *lou̯k-s-no- Old Irish lúan in día lúain "Monday," Avestan raoxšna- "light," (with presumed zero-grade) Greek lýkhnos "lamp" — more at light entry 1

First Known Use

15th century, in the meaning defined at sense 1

Time Traveler
The first known use of lunar was in the 15th century

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Cite this Entry

“Lunar.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lunar. Accessed 17 Jun. 2026.

Kids Definition

lunar

adjective
lu·​nar ˈlü-nər How to pronounce lunar (audio)
1
: of, relating to, or resembling the moon
lunar craters
a lunar landscape
2
: measured by the moon's revolution
lunar month

Medical Definition

lunar

adjective
lu·​nar
ˈlü-nər also -ˌnär
: lunate

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