always used before a noun
: of or relating to the moon
a lunar rock
the lunar surface
a lunar eclipse
a lunar month [=the time between one new moon and the next, one full moon and the next, etc.]
Cite this Entry
“Lunar.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/lunar. Accessed 17 Apr. 2026.
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