Is it farther or further?
1872, "of or pertaining to the human soul" (earlier psychical, 1640s), from Greek psykhikos "of the soul, spirit, or mind" (opposed to somatikos), also (New Testament) "concerned with the life only, animal, natural," from psykhe "soul, mind, life" (see psyche). Meaning "characterized by psychic gifts" first recorded 1871.
"a medium;" 1870; see psychic (adj.).
psychic psy·chic (sī'kĭk)
Of, relating to, affecting, or influenced by the human mind or psyche; mental.
Capable of extraordinary mental processes, such as extrasensory perception and mental telepathy.
Of or relating to such mental processes.