E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Trismegistus [thrice greatest].
Herm, the Egyptian philosopher, or Thoth, councillor of Osiris, King of Egypt, to whom is attributed a host of inventionsamongst others the art of writing in hieroglyphics, the first code of Egyptian laws, harmony, astrology, the lute and lyre, magic, and all mysterious sciences.