The Collaborative International Dictionary of English v.0.48:

Hawker \Hawk"er\ (h[add]k"[~e]r), n.
   One who sells wares by crying them in the street; hence, a
   peddler or a packman. --Swift.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Hawker \Hawk"er\, v. i.
   To sell goods by outcry in the street. [Obs.] --Hudibras.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Hawker \Hawk"er\, n. [Cf. AS. hafecere. See 1st Hawk.]
   A falconer.
   [1913 Webster]

WordNet (r) 3.0 (2006):

hawker
    n 1: someone who travels about selling his wares (as on the
         streets or at carnivals) [syn: peddler, pedlar,
         packman, hawker, pitchman]
    2: a person who breeds and trains hawks and who follows the
       sport of falconry [syn: falconer, hawker]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

HAWKERS. Persons going from place to place with goods and merchandise for
sale. To prevent impositions they are generally required to take out
licenses, under regulations established by the local laws of the states.