lunar

adjective

lu·​nar ˈlü-nər 

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

This lunar event also marks the first of three supermoons for 2026, a phenomenon where a full (or new) moon coincides with the Moon at or near its closest point to Earth. —Michael D'estries, Travel + Leisure, 1 Jan. 2026

For observers on Earth's night side in North America, South America, parts of Europe and Africa, the chief sight will be the edge of Earth's shadow creeping across the lunar surface, and perhaps a hint of red as totality is approached but then snatched away. —Jamie Carter, Space.com, 1 Jan. 2026

To help spot the differences, NASA offers an animation depicting the lunar phases for 2026, allowing sky watchers to visualize the moon throughout the year. —Lily Hautau, CNN Money, 1 Jan. 2026

Blue Origin claims that Blue Alchemist could facilitate lunar and Martian settlements, both for humans and robots. —IEEE Spectrum, 31 Dec. 2025

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

Phrases Containing lunar

• lunar caustic
• lunar eclipse
• lunar module
• lunar month

Rhymes for lunar

• schooner
• sooner
• spooner
• tuner
• lacunar
• semilunar

Kids Definition

lunar

adjective

lu·​nar ˈlü-nər 

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