1. wherewith - Noun
2. wherewith - Adverb
With which; -- used relatively.
With what; -- used interrogatively.
The necessary means or instrument.
Source: Webster's dictionaryIn Surah 22 Al-Hajj (The Pilgrimage) it is said, "Have they not travelled in the land, and have they hearts wherewith to feel and ears wherewith to hear? Source: Internet
The quote above records eight bolls of malt given to Friar John Cor wherewith to make aqua vitae over the previous year. Source: Internet