Source : Webster's Revised Unabridged Dictionary (1913)

Wherewith \Where*with"\, adv.
   1. With which; -- used relatively.

            The love wherewith thou hast loved me. --John xvii.
                                                  26.

   2. With what; -- used interrogatively.

            Wherewith shall I save Israel?        --Judg. vi.
                                                  15.

Wherewith \Where*with"\, n.
   The necessary means or instrument.

         So shall I have wherewith to answer him. --Ps. cxix.
                                                  42.

         The wherewith to meet excessive loss by radiation. --H.
                                                  Spencer.

Source : WordNet®

wherewith
     adv : out of, or by means of which; "tools wherewith to scrape the
           windshield of my car" [syn: {wherewithal}]