Thayer's Greek Lexicon

 1. to be a retailer, to peddle
2. to make money by selling anything
  1) to get sordid gain by dealing in anything, to do a thing for
base gain
  2) to trade in the word of God
2b1. to try to get base gain by teaching divine truth
  3) to corrupt, to adulterate
2c1. peddlers were in the habit of adulterating their
commodities for the sake of gain