The Collaborative International Dictionary of English v.0.48:

Lunar \Lu"nar\ (l[=u]"n[~e]r), a. [L. lunaris, fr. luna the
   moon. See Luna, and cf. Lunary.]
   1. Of or pertaining to the moon; as, lunar observations.
      [1913 Webster]

   2. Resembling the moon; orbed. --Dryden.
      [1913 Webster]

   3. Measured by the revolutions of the moon; as, a lunar
      month.
      [1913 Webster]

   4. Influenced by the moon, as in growth, character, or
      properties; as, lunar herbs. --Bacon.
      [1913 Webster]

   Lunar caustic (Med. Chem.), silver nitrate prepared to be
      used as a cautery; -- so named because silver was called
      luna by the ancient alchemists.

   Lunar cycle. Same as Metonic cycle. See under Cycle.

   Lunar distance, the angular distance of the moon from the
      sun, a star, or a planet, employed for determining
      longitude by the lunar method.

   Lunar method, the method of finding a ship's longitude by
      comparing the local time of taking (by means of a sextant
      or circle) a given lunar distance, with the Greenwich time
      corresponding to the same distance as ascertained from a
      nautical almanac, the difference of these times being the
      longitude.

   Lunar month. See Month.

   Lunar observation, an observation of a lunar distance by
      means of a sextant or circle, with the altitudes of the
      bodies, and the time, for the purpose of computing the
      longitude.

   Lunar tables.
      (a) (Astron.) Tables of the moon's motions, arranged for
          computing the moon's true place at any time past or
          future.
      (b) (Navigation) Tables for correcting an observed lunar
          distance on account of refraction and parallax.

   Lunar year, the period of twelve lunar months, or 354 days,
      8 hours, 48 minutes, and 34.38 seconds.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Lunar \Lu"nar\, n.
   1. (Astron.) A lunar distance.
      [1913 Webster]

   2. (Anat.) The middle bone of the proximal series of the
      carpus; -- called also semilunar, and intermedium.
      [1913 Webster]

WordNet (r) 3.0 (2006):

lunar
    adj 1: of or relating to or associated with the moon; "lunar
           surface"; "lunar module"

Moby Thesaurus II by Grady Ward, 1.0:

70 Moby Thesaurus words for "lunar":
   Cynthian, S-shaped, anagalactic, asteroidal, astral, astrologic,
   astrologistic, astrologous, astronomic, astrophysical, bicorn,
   celestial, circumplanetary, cislunar, corniform, crescent,
   crescent-shaped, crescentic, crescentiform, crescentlike, empyreal,
   empyrean, equinoctial, extragalactic, falcate, falciform, galactic,
   heavenly, heliacal, horn-shaped, horned, intercosmic,
   interplanetary, intersidereal, interstellar, lunary, lunate,
   luniform, lunular, lunulate, menisciform, meniscoid, meteoric,
   meteoritic, moon-shaped, moonlike, nebular, nebulose, nebulous,
   planetal, planetarian, planetary, planetesimal, semicircular,
   semilunar, sickle-like, sickle-shaped, sidereal, sigmoid, solar,
   sphery, star-spangled, star-studded, starry, stellar, stellary,
   terrestrial, two-horned, uranic, zodiacal



Bouvier's Law Dictionary, Revised 6th Ed (1856):

LUNAR. That which belongs to the moon; relating to the moon as a lunar
month. See Month.