Where-ŏf', adv.

adverb

(hwēr-ŏf', or hwēr-ōv'), adv. 1. Of which; — used relatively. I do not find the certain numbers whereof their armies did consist. Davies.

Of what; — used indefinitely. “How this world, when and whereof created.” Milton.
Of what; — used interrogatively. “Whereof was the house built?” Johnson.