Merriam-Webster Collegiate Dictionary - greek

 I. noun  Etymology: Middle English Greke, from Old English Greca, from Latin Graecus, from ~ Graikos  Date: before 12th century  1.  a. a native or inhabitant of ancient or modern Greece  b. a person of ~ descent  2.  a. the language used by the ~s from prehistoric times to the present constituting a branch of Indo-European — see Indo-European languages table  b. ancient ~ as used from the time of the earliest records to the end of the second century A.D. — see Indo-European languages table  c. often not capitalized translation of Latin Graecum (in the medieval phrase Graecum est; non potest legi Italian is ~; it cannot be read) something unintelligible it's ~ to me  3. a member of a ~-letter fraternity or sorority  II. adjective  Date: 14th century  1. of, relating to, or characteristic of Greece, the ~s, or ~ ~ architecture  2.  a. Eastern Orthodox  b. of or relating to an Eastern church using the Byzantine rite in ~  c. of or relating to the established Orthodox church of Greece  3. of or relating to fraternities or sororities the ~ system