[hwair-uhv, -ov, wair-]
adverb, conjunction
of what, which, or whom.

1150–1200; Middle English wherof. See where, of1

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World English Dictionary
whereof (wɛərˈɒv)
1.  of what or which person or thing?
2.  of which (person or thing): the man whereof I speak is no longer alive

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