Term used by French psychic researchers to indicate knowledge
acquired through cryptesthesia, i.e., without the use of
our five senses. Although this term was used by French psychic
researcher Eugèn Osty, it appears to have been originally
coined by researcher Emile Boirac (1851–1917) in his book
L’Avenir des sciences psychiques (Paris, 1917) and was so ascribed
in Osty’s book Supernormal Faculties in Man (London, 1923).
The term derives from the Greek words meta (after) and gnomon
(knower) and designates the phenomenon of supernormal
cognition, now generally called extrasensory perception by