The Collaborative International Dictionary of English v.0.48:

Greek \Greek\, a. [AS. grec, L. Graecus, Gr. ?: cf. F. grec. Cf.
   Grecian.]
   Of or pertaining to Greece or the Greeks; Grecian.
   [1913 Webster]

   Greek calends. See under Greek calends in the vocabulary.


   Greek Church (Eccl. Hist.), the Eastern Church; that part
      of Christendom which separated from the Roman or Western
      Church in the ninth century. It comprises the great bulk
      of the Christian population of Russia (of which this is
      the established church), Greece, Moldavia, and Wallachia.
      The Greek Church is governed by patriarchs and is called
      also the Byzantine Church.

   Greek cross. See Illust. (10) Of Cross.

   Greek Empire. See Byzantine Empire.

   Greek fire, a combustible composition which burns under
      water, the constituents of which are supposed to be
      asphalt, with niter and sulphur. --Ure.

   Greek rose, the flower campion.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Greek \Greek\, n.
   1. A native, or one of the people, of Greece; a Grecian;
      also, the language of Greece.
      [1913 Webster]

   2. A swindler; a knave; a cheat. [Slang]
      [1913 Webster]

            Without a confederate the . . . game of baccarat
            does not . . . offer many chances for the Greek.
                                                  --Sat. Rev.
      [1913 Webster]

   3. Something unintelligible; as, it was all Greek to me.
      [Colloq.]
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

59 Moby Thesaurus words for "Greek":
   Aesopian language, Babel, affiliate, argot, associate, babble,
   belonger, brother, cant, card-carrier, card-carrying member,
   cardholder, charter member, cipher, clubber, clubman, clubwoman,
   code, committeeman, comrade, conventioneer, conventioner,
   conventionist, cryptogram, double Dutch, drivel,
   dues-paying member, enlistee, enrollee, fellow, fraternity man,
   garble, gibberish, gift of tongues, glossolalia, gobbledygook,
   guildsman, honorary member, initiate, insider, jabber, jabberwocky,
   jargon, joiner, jumble, life member, member, noise, nonsense,
   one of us, pledge, scramble, secret language, sister,
   skimble-skamble, slang, socius, sorority girl, sorority woman



Easton's 1897 Bible Dictionary:

Greek
   Found only in the New Testament, where a distinction is observed
   between "Greek" and "Grecian" (q.v.). The former is (1) a Greek
   by race (Acts 16:1-3; 18:17; Rom. 1:14), or (2) a Gentile as
   opposed to a Jew (Rom. 2:9, 10). The latter, meaning properly
   "one who speaks Greek," is a foreign Jew opposed to a home Jew
   who dwelt in Palestine.

     The word "Grecians" in Acts 11:20 should be "Greeks," denoting
   the heathen Greeks of that city, as rendered in the Revised
   Version according to the reading of the best manuscripts
   ("Hellenes").