Why is the ninth month called September?
word-forming element meaning "mind, mental; spirit, unconscious," from Greek psykho-, combining form of psykhe (see psyche). It also was used to form compounds in Greek, e.g. psychopates "soul-beguiling."
psycho- or psych-
Mind; mental: psychogenic.
Mental activities or processes: psychomotor.
Psychology; psychological: psychosocial.