Definition of "whereof" []

• Of what: I know whereof I speak. (conjunction)
• Of which: ancient pottery whereof many examples are lost. (conjunction)
• Of whom. (conjunction)
• Archaic Of what. (adverb)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "There is one English poem especially which I should despair of ever making you understand, the title whereof is “Hudibras."
• "And in his reply to Mr. Chillingworth, he hath a chapter of above one hundred and fifty pages, the title whereof is, "Scripture is not the only rule of faith;" which (had he with Mr.S. believed oral tradition to be the sole rule of faith) had been as absurd as it would be to write a book to prove that Turks are not the only Christians in the world."
• "There is one English poem especially which I should despair of ever making you understand, the title whereof is "Hudibras.""