WordNet (r) 3.0 (2006):

Hebrews
    n 1: the ethnic group claiming descent from Abraham and Isaac
         (especially from Isaac's son Jacob); the nation whom God
         chose to receive his revelation and with whom God chose to
         make a covenant (Exodus 19) [syn: Hebrews, Israelites]
    2: a New Testament book traditionally included among the epistle
       of Saint Paul but now generally considered not to have been
       written by him [syn: Epistle to the Hebrews, Hebrews]

Easton's 1897 Bible Dictionary:

Hebrews
   (Acts 6:1) were the Hebrew-speaking Jews, as distinguished from
   those who spoke Greek. (See GREEKS.)


Hitchcock's Bible Names Dictionary (late 1800's):

Hebrews, descendants of Heber