The Collaborative International Dictionary of English v.0.48:

Hebrew \He"brew\, n. [F. H['e]breu, L. Hebraeus, Gr. ?, fr. Heb.
   'ibhr[imac].]
   1. An appellative of Abraham or of one of his descendants,
      esp. in the line of Jacob; an Israelite; a Jew.
      [1913 Webster]

            There came one that had escaped and told Abram the
            Hebrew.                               --Gen. xiv.
                                                  13.
      [1913 Webster]

   2. The language of the Hebrews; -- one of the Semitic family
      of languages.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Hebrew \He"brew\, a.
   Of or pertaining to the Hebrews; as, the Hebrew language or
   rites.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Hebrew
    adj 1: of or relating to or characteristic of the Hebrews; "the
           old Hebrew prophets" [syn: Hebraic, Hebraical,
           Hebrew]
    2: of or relating to the language of the Hebrews; "Hebrew
       vowels" [syn: Hebraic, Hebraical, Hebrew]
    n 1: the ancient Canaanitic language of the Hebrews that has
         been revived as the official language of Israel
    2: a person belonging to the worldwide group claiming descent
       from Jacob (or converted to it) and connected by cultural or
       religious ties [syn: Jew, Hebrew, Israelite]

Easton's 1897 Bible Dictionary:

Hebrew
   a name applied to the Israelites in Scripture only by one who is
   a foreigner (Gen. 39:14, 17; 41:12, etc.), or by the Israelites
   when they speak of themselves to foreigners (40:15; Ex. 1:19),
   or when spoken of an contrasted with other peoples (Gen. 43:32;
   Ex. 1:3, 7, 15; Deut. 15:12). In the New Testament there is the
   same contrast between Hebrews and foreigners (Acts 6:1; Phil.
   3:5).

     Derivation. (1.) The name is derived, according to some, from
   Eber (Gen. 10:24), the ancestor of Abraham. The Hebrews are
   "sons of Eber" (10:21).

     (2.) Others trace the name of a Hebrew root-word signifying
   "to pass over," and hence regard it as meaning "the man who
   passed over," viz., the Euphrates; or to the Hebrew word meaning
   "the region" or "country beyond," viz., the land of Chaldea.
   This latter view is preferred. It is the more probable origin of
   the designation given to Abraham coming among the Canaanites as
   a man from beyond the Euphrates (Gen. 14:13).

     (3.) A third derivation of the word has been suggested, viz.,
   that it is from the Hebrew word _'abhar_, "to pass over," whence
   _'ebher_, in the sense of a "sojourner" or "passer through" as
   distinct from a "settler" in the land, and thus applies to the
   condition of Abraham (Heb. 11:13).


The Devil's Dictionary (1881-1906):

HEBREW, n.  A male Jew, as distinguished from the Shebrew, an
altogether superior creation.