Whereof

1.

(of which, of what) អំពីអ្វីដែល, ជាវត្ថុរឺរឿងដែល
Example: the matter whereof we spoke.

1.

(បច្ចេកទេស) (form) in witness whereof I sign my head ខ្ញុំចុះហត្ថលេខាធ្វើជាសាក្សីថានេះគឺត្រឹមត្រូវ

1.

Of which; of whom; formerly, also, with which; -- used relatively.

2.

Of what; -- used interrogatively.