whereof

[ hwair-uhv, -ov, wair- ]
/ ʰwɛərˈʌv, -ˈɒv, wɛər- /

adverb, conjunction

of what, which, or whom.

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. 2019

Examples from the Web for whereof

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