Etymology

whereof

W4H4E1R1E1O1F4

Today it means: Of what. Full definition →

Middle English wherof
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The story

  1. Middle English · inherited fromwherof
  2. English todaywhereof

From Middle English wherof; equivalent to where + of. Compare the parallel formations of Swedish varav and Dutch waaraf.

Etymology from Wiktionary, CC BY-SA 4.0.