of or relating to the moon: the lunar orbit.
measured by the moon's revolutions: a lunar month.
resembling the moon; round or crescent-shaped.
of or relating to silver.


a lunar observation taken for purposes of navigation or mapping.

Origin of lunar

First recorded in 1585–95, lunar is from the Latin word lūnāris of the moon. See Luna, -ar1
Related formsun·lu·nar, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for lunar

moony, celestial, planetary, stellar, solar, lunatic

Examples from the Web for lunar

Contemporary Examples of lunar

Historical Examples of lunar

British Dictionary definitions for lunar



of or relating to the moon
occurring on, used on, or designed to land on the surface of the moonlunar module
relating to, caused by, or measured by the position or orbital motion of the moon
of or containing silver

Word Origin for lunar

C17: from Latin lūnāris, from lūna the moon
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for lunar

"crescent-shaped," early 15c.; "pertaining to the moon," 1620s, from Old French lunaire (15c.), from Latin lunaris "of the moon," from luna "moon," (with capital L- "moon goddess"); see Luna.

Online Etymology Dictionary, © 2010 Douglas Harper

lunar in Medicine




Relating to the moon or to a month.
Containing silver.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

lunar in Science



Relating to the Moon.
Measured by the revolution of the Moon around the Earth.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.