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.
      [1913 Webster]