The Collaborative International Dictionary of English v.0.48:

Pettifogger \Pet"ti*fog`ger\, n.
   A lawyer who deals in petty cases; an attorney whose methods
   are mean and tricky; an inferior lawyer.
   [1913 Webster]

         A pettifogger was lord chancellor.       --Macaulay.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pettifogger
    n 1: a person (especially a lawyer or politician) who uses
         unscrupulous or unethical methods [syn: shyster,
         pettifogger]
    2: a disputant who quibbles; someone who raises annoying petty
       objections [syn: quibbler, caviller, caviler,
       pettifogger]