whereof

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

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

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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
For the real price of labor is knowledge and virtue, whereof wealth and credit are signs.
Rick is our premier historian of the rise of modern movement conservatism, and knows whereof he speaks.
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