Word Study
whereof
CIDE DICTIONARY
whereof, adv.
- Of which; of whom; formerly, also, with which; -- used relatively. [1913 Webster]"I do not find the certain numbers whereof their armies did consist." [1913 Webster]"Let it work like Borgias' wine,
Whereof his sire, the pope, was poisoned." [1913 Webster]"Edward's seven sons, whereof thyself art one." [1913 Webster] - Of what; -- used interrogatively. [1913 Webster]"Whereof was the house built?" [1913 Webster]
OXFORD DICTIONARY
whereof, conj. & adv. formal
--conj. of what or which (the means whereof).
--adv. of what?
--conj. of what or which (the means whereof).
--adv. of what?
For further exploring for "whereof" in Webster Dictionary Online