Online Etymology Dictionary

pseudo-science (n.): also pseudoscience, "a pretended or mistaken science," 1796 (the earliest reference is to alchemy), from pseudo- + science.
The term pseudo-science is hybrid, and therefore objectionable. Pseudognosy would be better etymology, but the unlearned might be apt to association with it the idea of a dog's nose, and thus, instead of taking "the eel of science by the tail," take the cur of science by the snout; so that all things considered we had better adopt the current term pseudo-sciences ["The Pseudo-Sciences," in "The St. James Magazine," January 1842]
pseudo-scientific (adj.): also pseudoscientific, 1816; see pseudo- + scientific; also cf. pseudo-science.
pseudocide (n.): "pretended suicide attempt," 1959, from pseudo- + ending abstracted from suicide.
pseudograph (n.): "writing falsely ascribed to someone," 1828 (in German from 1809), from Late Latin pseudographus, from Greek pseudographos "writer of falsehoods," from pseudo- (see pseudo-) + graphos "(something) drawn or written" (see -graphy). Pseudography was in English from 1570s with a sense "misspelling."
pseudomorph (n.): "irregular form," 1838, earlier in German and French, from pseudo- + Greek morphe "form" (see Morpheus). Related: Pseudomorphic.
pseudonym (n.): 1828, in part a back-formation from pseudonymous, in part from German pseudonym and French pseudonyme (adj.), from Greek pseudonymos "having a false name, under a false name," from pseudes "false" (see pseudo-) + onyma, Aeolic dialectal variant of onoma "name" (see name (n.)).

"Possibly a dictionary word" at first [Barnhart]. Fowler calls it "a queer out-of-the-way term for an everyday thing." Properly in reference to made-up names; the name of an actual author or person of reputation affixed to a work he or she did not write is an allonym. An author's actual name affixed to his or her own work is an autonym (1867).
pseudonymous (adj.): 1766, from Modern Latin pseudonymus, from Greek pseudonymos (see pseudonym). Related: Pseudonymously.
pseudopod (n.): 1862, from Modern Latin pseudopodium (itself in English from 1854), from Latinized form of Greek pseudo- (see pseudo-) + podion, diminutive of pous "foot" (see foot (n.)). Related: Pseudopodal.
pshaw (interj.): exclamation of contempt or rejection, by 1670s.
psi (n.): 23rd letter of the Greek alphabet. Use for "psychic force, paranormal phenomenon" dates from 1942 (probably from psychic (adj.)).
psilanthropism (n.): "the teaching that Jesus was entirely human," 1817, from Greek psilanthropos "merely human," from psilos "naked, bare, mere" (see psilo-) + anthropos "man" (see anthropo-). Related: Psilanthropy; psilanthropic; psilanthropist.
psilo-: before vowels psil-, word-forming element meaning "stripped, bare," from Greek psilos "bare, naked; mere," perhaps akin to psen "to rub," and both or either perhaps from PIE root *bhes- "to rub" (cf. Greek psamathos "sand;" see sand (n.)).
psilocybin (n.): 1958, from Modern Latin psilocybe, name of a Central American species of mushroom, from Greek psilos "bare" (see psilo-) + kybe "head."
psilosis (n.): "loss of hair through disease," 1837, medical Latin, from Greek psilosis "a stripping of hair," from psiloun "to strip of hair," from psilos "bare" (see psilo-).
psionic (adj.): 1952, from psi + ending from electronic, etc.
psittacine (adj.): "pertaining to parrots," 1826, from Latin psittacinus, from psittacus "parrot," from Greek psittakos "a parrot," said to be a foreign word.
psittacism (n.): "mere parroting, parrotry, repetition without reasoning," 1884, from French psittacisme (Liebnitz, 1765) or German psittazismus, from Latin psittacus "parrot" (see psittacine) + -ism.
psoas (n.): 1680s, from Greek psoa (plural psoai) "muscles of the loins." Related: Psoitis.
Gk. [psoas], the gen. of the feminine noun [psoa], was mistaken by the French anatomist Jean Riolan (1577-1657) for the nom. of a (nonexistent) masculine noun. It was he who introduced this erroneous form into anatomy." [Klein]
psoriasis (n.): 1680s, from medical Latin psoriasis, in Late Latin "mange, scurvy," from Greek psoriasis "being itchy," from psorian "to have the itch," from psora "itch, mange, scab," related to psen "to rub" (see psilo-). Related: Psoriatic.
psych: as a noun, short for psychology in various senses (e.g. as an academic study, in student slang by 1895). As a verb, first attested 1917 as "to subject to psychoanalysis," short for psychoanalyze. From 1934 as "to outsmart" (also psych out); from 1963 as "to unnerve." However to psych (oneself) up is from 1972; to be psyched up is attested from 1968.
psyche (n.): 1640s, "animating spirit," from Latin psyche, from Greek psykhe "the soul, mind, spirit; breath; life, one's life, the invisible animating principle or entity which occupies and directs the physical body; understanding" (personified as Psykhe, the beloved of Eros), akin to psykhein "to blow, cool," from PIE root *bhes- "to blow, to breathe" (cf. Sanskrit bhas-), "Probably imitative" [Watkins].

Also in ancient Greek, "departed soul, spirit, ghost," and often represented symbolically as a butterfly or moth. The word had extensive sense development in Platonic philosophy and Jewish-influenced theological writing of St. Paul (cf. spirit (n.)). Meaning "human soul" is from 1650s. In English, psychological sense "mind," is attested by 1910.
psychedelia (n.): 1967, from psychedelic + -ia.
psychedelic (adj.): occasionally psychodelic, 1956, of drugs, suggested by British-born Canadian psychiatrist Humphry Osmond (1917-2004) in a letter to Aldous Huxley and used by Osmond in a scientific paper published the next year; from Greek psykhe- "mind" (see psyche) + deloun "make visible, reveal," from delos "visible, clear," from PIE root *dyeu- "to shine" (see diurnal). In popular use from 1965 with reference to anything producing effects similar to that of a psychedelic drug or enhancing the effects of such a drug. As a noun from 1956.
psychedelicize (v.): 1966, from psychedelic + -ize. Related: Psychedelicized; psychedelicizing.
psychiatric (adj.): 1847, from French psychiatrique or else coined in English from psychiatry + -ic.
psychiatrist (n.): 1875, from psychiatry + -ist.
A psychiatrist is a man who goes to the Folies Bergère and looks at the audience. [Anglican Bishop Mervyn Stockwood, 1961]
An older name was mad-doctor (1703); also psychiater "expert in mental diseases" (1852), from Greek psyche + iatros. Also cf. alienist.
psychiatry (n.): 1846, from French psychiatrie, from Medieval Latin psychiatria, literally "a healing of the soul," from Latinized form of Greek psykhe- "mind" (see psyche) + iatreia "healing, care" (see -iatric).
psychic (adj.): 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.
psychic (n.): "a medium;" 1870; see psychic (adj.).
psycho (adj.): 1927, shortening of psychological; 1936 (Raymond Chandler) as shortening of psychopathic (adj.).
psycho (n.): 1925, short for psychologist; as short for psychopath from 1942.
psycho-: 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-history (n.): 1934, from psycho- + history.
psychoactive (adj.): also psycho-active, 1959, from psycho- + active.
psychoanalysis (n.): 1906, from Psychoanalyse, coined 1896 in French by Freud from Latinized form of Greek psykhe- "mental" (see psyche) + German Analyse, from Greek analysis (see analysis). Freud earlier used psychische analyse (1894).
psychoanalyst (n.): also psycho-analyst, 1910; see psycho- + analyst.
psychoanalytic (adj.): 1902, from psychoanalysis + -ic.
psychoanalyze (v.): also psycho-analyse, psychoanalyse, 1911; see psycho- + analyze. Related: Psychoanalyzed; psychoanalyzing. Earlier was psychologize (1830).
psychobabble (n.): 1976, from psycho- (representing psychology) + babble (n.). Earlier was psychologese (1961).
psychodrama (n.): also psycho-drama, 1937 (in writing of U.S. psychiatrist Jacob L. Moreno (1889-1974)), from psycho- + drama. Related: Psychodramatic.
psychodynamic (adj.): also psycho-dynamic, 1856, from psycho- + dynamic (adj.).
psychogenesis (n.): also psycho-genesis, 1838, "origin of the soul or mind," from psycho- + genesis. Related: Psychogenetic; psychogenetical.
psychogenic (adj.): 1884, from psycho- + -genic.
psychographic (adj.): also psycho-graphic, 1856, from psychograph "supernatural photographic image," from psycho- + -graph. Related: Psychographics.
psychography (n.): 1883, "history of an individual soul; the natural history of the phenomenon of mind," from psycho- + -graphy. Meaning "spirit-writing" is from 1876.
psychokinesis (n.): 1914 [Henry Holt, "On the Cosmic Relations"], from psycho- + kinesis. Related: Psychokinetic (1904).
psychological (adj.): 1680s; see psychology + -ical. Related: Psychologically. Psychological warfare recorded from 1940. Psychological moment was in vogue from 1871, from French moment psychologique "moment of immediate expectation of something about to happen."
The original German phrase, misinterpreted by the French & imported together with its false sense into English, meant the psychic factor, the mental effect, the influence exerted by a state of mind, & not a point of time at all, das Moment in German corresponding to our momentum, not our moment. [Fowler]
psychologist (n.): 1727; see psychology + -ist.
psychology (n.): 1650s, "study of the soul," from Modern Latin psychologia, probably coined mid-16c. in Germany by Melanchthon from Latinized form of Greek psykhe- "breath, spirit, soul" (see psyche) + logia "study of" (see -logy). Meaning "study of the mind" first recorded 1748, from Christian Wolff's "Psychologia empirica" (1732); main modern behavioral sense is from early 1890s.
psychometric (adj.): also psycho-metric, 1854, from psychometry (1854), the alleged power of reading the history of an object by handling it, + -ic. In reference to the measurement of the duration of mental states, from 1879, from psycho- + -metric.