The Collaborative International Dictionary of English v.0.48:

Street \Street\ (str[=e]t), n. [OE. strete, AS. str[=ae]t, fr.
   L. strata (sc. via) a paved way, properly fem. p. p. of
   sternere, stratum, to spread; akin to E. strew. See Strew,
   and cf. Stratum, Stray, v. & a.]
   1. Originally, a paved way or road; a public highway; now
      commonly, a thoroughfare in a city or village, bordered by
      dwellings or business houses.
      [1913 Webster]

            He removed [the body of] Amasa from the street unto
            the field.                            --Coverdale.
      [1913 Webster]

            At home or through the high street passing.
                                                  --Milton.
      [1913 Webster]

   Note: In an extended sense, street designates besides the
         roadway, the walks, houses, shops, etc., which border
         the thoroughfare.
         [1913 Webster]

               His deserted mansion in Duke Street. --Macaulay.
         [1913 Webster]

   2. the roadway of a street[1], as distinguished from the
      sidewalk; as, children playing in the street.
      [PJC]

   3. the inhabitants of a particular street; as, the whole
      street knew about their impending divorce.
      [PJC]

   The street (Broker's Cant), that thoroughfare of a city
      where the leading bankers and brokers do business; also,
      figuratively, those who do business there; as, the street
      would not take the bonds.

   on the street,
      (a) homeless.
      (b) unemployed.
      (a) not in prison, or released from prison; the murderer
          is still on the street.

   Street Arab, Street broker, etc. See under Arab,
      Broker, etc.

   Street door, a door which opens upon a street, or is
      nearest the street.

   street person, a homeless person; a vagrant.
      [1913 Webster +PJC]

   Syn: See Way.
        [1913 Webster]

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):

street arab
    n 1: (sometimes offensive) a homeless boy who has been abandoned
         and roams the streets [syn: street arab, gamin,
         throwaway]

Moby Thesaurus II by Grady Ward, 1.0:

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