Whereof definition

wâr-ŏv, -ŭv, hwâr-
Of what.
adverb
2
0
Of what; of which; of whom.
conjunction
1
0
(archaic) Of what.
adverb
1
0
Of what.

I know whereof I speak.

conjunction
0
0
Of which.

Ancient pottery whereof many examples are lost.

conjunction
0
0
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Of whom.
conjunction
0
0
Of what, which, or whom.

The things whereof he spoke.

adverb
0
0
(archaic) Of which.
adverb
0
0