The Collaborative International Dictionary of English v.0.48:

Prowl \Prowl\, v. t. [imp. & p. p. Prowled; p. pr. & vb. n.
   Prowling.] [OE. prollen to search about; of uncertain
   origin, perh. for proglen, a dim. of prog to beg, or proke to
   poke. Cf. Proke.]
   1. To rove over, through, or about in a stealthy manner;
      esp., to search in, as for prey or booty.
      [1913 Webster]

            He prowls each place, still in new colors decked. --
                                                  Sir P. Sidney.
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   2. To collect by plunder; as, to prowl money. [Obs.]
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The Collaborative International Dictionary of English v.0.48:

Prowl \Prowl\, v. i.
   To rove or wander stealthily, esp. for prey, as a wild beast;
   hence, to prey; to plunder.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Prowl \Prowl\, n.
   The act of prowling. [Colloq.] --Smart.
   [1913 Webster]

WordNet (r) 3.0 (2006):

prowl
    n 1: the act of prowling (walking about in a stealthy manner)
    v 1: move about in or as if in a predatory manner; "The
         suspicious stranger prowls the streets of the town"
    2: loiter about, with no apparent aim [syn: prowl, lurch]