WordReference Random House Learner's Dictionary of American English © 2017
lu•nar /ˈlunɚ/USA pronunciation   adj. [before a noun]
  1. Astronomyof or relating to the moon:lunar orbit; a lunar month.

WordReference Random House Unabridged Dictionary of American English © 2017
lu•nar  (lo̅o̅nər),USA pronunciation adj. 
  1. Astronomyof or pertaining to the moon:the lunar orbit.
  2. Astronomymeasured by the moon's revolutions:a lunar month.
  3. resembling the moon;
    round or crescent-shaped.
  4. Chemistryof or pertaining to silver.

  1. Astronomya lunar observation taken for purposes of navigation or mapping.
  • Latin lūnāris of the moon. See Luna, -ar1
  • 1585–95

Collins Concise English Dictionary © HarperCollins Publishers::

lunar /ˈluːnə/ adj
  1. of or relating to the moon
  2. occurring on, used on, or designed to land on the surface of the moon: lunar module
  3. relating to, caused by, or measured by the position or orbital motion of the moon
Etymology: 17th Century: from Latin lūnāris, from lūna the moon

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