lunar caustic

From The Collaborative International Dictionary of English v.0.48:

Nitrate \Ni"trate\, n. [Cf. F. nitrate.] (Chem.)
   A salt of nitric acid.
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   Nitrate of silver, a white crystalline salt (AgNO3), used
      in photography and as a cauterizing agent; -- called also
      lunar caustic, and more commonly called {silver
      [1913 Webster +PJC]

From 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.
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   2. Resembling the moon; orbed. --Dryden.
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   3. Measured by the revolutions of the moon; as, a lunar
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   4. Influenced by the moon, as in growth, character, or
      properties; as, lunar herbs. --Bacon.
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   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

   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

   Lunar tables.
      (a) (Astron.) Tables of the moon's motions, arranged for
          computing the moon's true place at any time past or
      (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.
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