The Collaborative International Dictionary of English v.0.48:

Sinaic \Si*na"ic\, Sinaitic \Si`na*it"ic\, a. [From Mount
   Sinai.]
   Of or pertaining to Mount Sinai; given or made at Mount
   Sinai; as, the Sinaitic law.
   [1913 Webster]

   Sinaitic manuscript, a fourth century Greek manuscript of
      the part Bible, discovered at Mount Sinai (the greater
      part of it in 1859) by Tisschendorf, a German Biblical
      critic; -- called also Codex Sinaiticus.
      [1913 Webster]