The Collaborative International Dictionary of English v.0.48:

Arab \Ar"ab\ (?; 277), n. [Prob. ultimately fr. Heb. arabah a
   desert, the name employed, in the Old Testament, to denote
   the valley of the Jordan and Dead Sea. Ar. Arab, Heb. arabi,
   arbi, arbim: cf. F. Arabe, L. Arabs, Gr. ?.]
   One of a swarthy race occupying Arabia, and numerous in
   Syria, Northern Africa, etc.
   [1913 Webster]

   Street Arab, a homeless vagabond in the streets of a city,
      particularly and outcast boy or girl. --Tylor.
      [1913 Webster]

            The ragged outcasts and street Arabs who are
            shivering in damp doorways.           --Lond. Sat.
                                                  Rev.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Arab
    n 1: a member of a Semitic people originally from the Arabian
         peninsula and surrounding territories who speaks Arabic and
         who inhabits much of the Middle East and northern Africa
         [syn: Arab, Arabian]
    2: a spirited graceful and intelligent riding horse native to
       Arabia [syn: Arabian, Arab]

Moby Thesaurus II by Grady Ward, 1.0:

51 Moby Thesaurus words for "Arab":
   Bedouin, Bohemian, Romany, Zigeuner, beach bum, beachcomber,
   beggar, bo, bum, bummer, dogie, gamin, gamine, guttersnipe, gypsy,
   hobo, homeless waif, idler, landloper, lazzarone, loafer, losel,
   mudlark, nomad, piker, ragamuffin, ragman, ragpicker, rounder,
   ski bum, stiff, stray, street Arab, street urchin, sundowner,
   surf bum, swagman, swagsman, tatterdemalion, tennis bum, tramp,
   turnpiker, tzigane, urchin, vag, vagabond, vagrant, waif,
   waifs and strays, wastrel, zingaro



Easton's 1897 Bible Dictionary:

Arab
   ambush, a city in the mountains of Judah (Josh. 15:52), now
   Er-Rabiyeh.


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

Arab, multiplying; sowing sedition; a window; a locust


U.S. Gazetteer Places (2000):

Arab, AL -- U.S. city in Alabama
   Population (2000):    7174
   Housing Units (2000): 3223
   Land area (2000):     12.768564 sq. miles (33.070427 sq. km)
   Water area (2000):    0.081631 sq. miles (0.211423 sq. km)
   Total area (2000):    12.850195 sq. miles (33.281850 sq. km)
   FIPS code:            02116
   Located within:       Alabama (AL), FIPS 01
   Location:             34.327863 N, 86.498613 W
   ZIP Codes (1990):     35016
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Arab, AL
    Arab