The Collaborative International Dictionary of English v.0.48:

Nautical \Nau"tic*al\, a. [L. nauticus, Gr. naytiko`s, fr.
   nay`ths a seaman, sailor, fr. nay^s ship: cf. F. nautique.
   See Nave of a church.]
   Of or pertaining to seamen, to the art of navigation, or to
   ships; as, nautical skill.
   [1913 Webster]

   Syn: Naval; marine; maritime. See Naval.
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   Nautical almanac. See under Almanac.

   Nautical distance, the length in nautical miles of the
      rhumb line joining any two places on the earth's surface.


   nautical mile. See under Mile.
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The Collaborative International Dictionary of English v.0.48:

Almanac \Al"ma*nac\ (?; 277), n. [LL. almanac, almanach: cf. F.
   almanach, Sp. almanaque, It. almanacco, all of uncertain
   origin.]
   A book or table, containing a calendar of days, and months,
   to which astronomical data and various statistics are often
   added, such as the times of the rising and setting of the sun
   and moon, eclipses, hours of full tide, stated festivals of
   churches, terms of courts, etc.
   [1913 Webster]

   Nautical almanac, an almanac, or year book, containing
      astronomical calculations (lunar, stellar, etc.), and
      other information useful to mariners.
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