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2. Of or pertaining to the mind, or its functions and diseases; mental; -- contrasted with physical.

Psychical blindness, Psychical deafness (Med.), forms of nervous disease in which, while the senses of sight and hearing remain unimpaired, the mind fails to appreciate the significance of the sounds heard or the images seen. -- Psychical contagion, the transference of disease, especially of a functional nervous disease, by mere force of example. -- Psychical medicine, that department of medicine which treats of mental diseases.

Psy"chics (?), n. Psychology.

Psy"chism (?), n. [Cf. F. psychisme.] (Philos.) The doctrine of Quesne, that there is a fluid universally diffused, end equally animating all living beings, the difference in their actions being due to the difference of the individual organizations. Fleming.

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Psy"cho- (?). A combining form from Gr. psychh` the soul, the mind, the understanding; as, psychology.

Psy`cho*gen"e*sis (?), n. Genesis through an internal force, as opposed to natural selection.

Psy*chog"ra*phy (?), n. [Psycho- + -graphy.] 1. A description of the phenomena of mind.

2. (Spiritualism) Spirit writing.

{ Psy`cho*log"ic (?), Psy`cho*log"ic*al (?), } a. [Cf. F. psychologique.] Of or pertaining to psychology. See Note under Psychic. -- Psy`cho*log"ic*al*ly, adv.

Psy*chol"o*gist (?), n. [Cf. F. psychologiste.] One who is versed in, devoted to, psychology.

Psy"cho*logue (?), n. A psychologist.

Psy*chol"o*gy (?), n. pl. Psychologies (&?;). [Psycho- + -logy: cf. F. psychologie. See Psychical.] The science of the human soul; specifically, the systematic or scientific knowledge of the powers and functions of the human soul, so far as they are known by consciousness; a treatise on the human soul.

Psychology, the science conversant about the phenomena of the mind, or conscious subject, or self.

Sir W. Hamilton.

Psy*chom"a*chy (?), n. [L. psychomachia, fr. Gr. psychh` the soul + &?; fight: cf. &?; desperate fighting.] A conflict of the soul with the body.

Psy"cho*man`cy (?), n. [Psycho- + -mancy: cf. F. psychomancie.] Necromancy.

Psy*chom"e*try (?), n. [Psycho- + -metry.] (Physiol.) The art of measuring the duration of mental processes, or of determining the time relations of mental phenomena. -- Psy`cho*met"ric (#), a.

Psy`cho-mo"tor (?), a. [Psycho- + motor.] Of or pertaining to movement produced by action of the mind or will.

Psy"cho*pan"ny*chism (?), n. [Psycho- + Gr. &?; to spend all night long; &?;, &?;, all + &?; night.] (Theol.) The doctrine that the soul falls asleep at death, and does not wake until the resurrection of the body. -- Psy`cho*pan"ny*chism (#), n.

Psy*chop"a*thy (?), n. [Psycho- + Gr. &?;, &?;.] (Med.) Mental disease. See Psychosis, 2. -- Psy`cho*path"ic, a. -- Psy*chop"a*thist, n.

Psy`cho*phys"ic*al (?), a. Of or pertaining to psychophysics; involving the action or mutual relations of the psychical and physical in man.

Psychophysical time (Physiol.), the time required for the mind to transform a sensory impression into a motor impulse. It is an important part of physiological or reaction time. See under Reaction.

Psy`cho*phys"ics (?), n. [Psycho- + physics.] The science of the connection between nerve action and consciousness; the science which treats of the relations of the psychical and physical in their conjoint operation in man; the doctrine of the relation of function or dependence between body and soul.

Psy"cho*pomp (?), n. [Gr. &?;; psychh` the soul + &?; to send: cf. F. psychopompe.] (Myth.) A leader or guide of souls . J. Fiske.

Psy*cho"sis (?), n. [NL. See Psycho- .]

1. Any vital action or activity. Mivart.

2. (Med.) A disease of the mind; especially, a functional mental disorder, that is, one unattended with evident organic changes.