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whereof

[ wair-uhv, -ov, hwair- ]
/ wɛərˈʌv, -ˈɒv, ʰwɛər- /
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adverb, conjunction
of what, which, or whom.
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Origin of whereof

First recorded in 1150–1200, whereof is from the Middle English word wherof.See where, of1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use whereof in a sentence

British Dictionary definitions for whereof

whereof
/ (wɛərˈɒv) archaic, or formal /

adverb
of what or which person or thing?
pronoun
of which (person or thing)the man whereof I speak is no longer alive
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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