| psalm | (noun) any sacred song used to praise the deity | - |
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| psalmist | (noun) a composer of sacred songs | - |
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| psalmody | (noun) the act of singing psalms or hymns | Synonyms: hymnody |
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| psalterium | (noun) the third compartment of the stomach of a ruminant | Synonyms: omasum, third stomach |
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| psaltery | (noun) an ancient stringed instrument similar to the lyre or zither but having a trapezoidal sounding board under the strings | - |
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| psammoma | (noun) a tumor derived from fibrous tissue of the meninges or choroid plexus or certain other structures associated with the brain; characterized by sandlike particles | Synonyms: sand tumor |
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| psephologist | (noun) a sociologist who studies election trends | - |
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| psephology | (noun) the branch of sociology that studies election trends (as by opinion polls) | - |
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| pseud | (noun) a person who makes deceitful pretenses | Synonyms: fake, faker, fraud, imposter, impostor, pretender, pseudo, role player, sham, shammer |
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| pseudo | (noun) a person who makes deceitful pretenses | Synonyms: fake, faker, fraud, imposter, impostor, pretender, pseud, role player, sham, shammer |
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| pseudobulb | (noun) a solid bulblike enlargement of the stem of some orchids | - |
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| pseudocarp | (noun) fruit containing much fleshy tissue besides that of the ripened ovary; as apple or strawberry | Synonyms: accessory fruit |
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| pseudocyesis | (noun) physiological state in which a woman exhibits symptoms of pregnancy but is not pregnant | Synonyms: false pregnancy |
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| pseudoephedrine | (noun) poisonous crystalline alkaloid occurring with ephedrine and isomorphic with it | - |
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| pseudohallucination | (noun) an image vivid enough to be a hallucination but recognized as unreal | - |
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| pseudohermaphrodite | (noun) someone having external genitalia of one sex and internal sex organs of the other sex; not a true hermaphrodite because there is no ambiguity in the sex of the external genitalia and hence no question about gender at birth | - |
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| pseudohermaphroditism | (noun) congenital condition in which a person has external genitalia of one sex and internal sex organs of the other sex | - |
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| pseudomonad | (noun) bacteria usually producing greenish fluorescent water-soluble pigment; some pathogenic for plants and animals | - |
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| pseudonym | (noun) a fictitious name used when the person performs a particular social role | Synonyms: anonym, nom de guerre |
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| pseudophloem | (noun) false phloem | - |
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| pseudopod | (noun) temporary outgrowth used by some microorganisms as an organ of feeding or locomotion | Synonyms: pseudopodium |
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| pseudopodium | (noun) temporary outgrowth used by some microorganisms as an organ of feeding or locomotion | Synonyms: pseudopod |
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| pseudorubella | (noun) a viral disease of infants and young children; characterized by abrupt high fever and mild sore throat; a few days later there is a faint pinkish rash that lasts for a few hours to a few days | Synonyms: exanthema subitum, roseola infantilis, roseola infantum |
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| pseudoscience | (noun) an activity resembling science but based on fallacious assumptions | - |
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| pseudoscorpion | (noun) small nonvenomous arachnid resembling a tailless scorpion | Synonyms: false scorpion |
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| pseudosmallpox | (noun) a mild form of smallpox caused by a less virulent form of the virus | Synonyms: alastrim, Cuban itch, Kaffir pox, milk pox, pseudovariola, variola minor, West Indian smallpox, white pox |
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| pseudovariola | (noun) a mild form of smallpox caused by a less virulent form of the virus | Synonyms: alastrim, Cuban itch, Kaffir pox, milk pox, pseudosmallpox, variola minor, West Indian smallpox, white pox |
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| psi | (noun) the 23rd letter of the Greek alphabet | - |
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| (noun) a unit of pressure | Synonyms: pounds per square inch |
| psilocin | (noun) a hallucinogenic compound obtained from a mushroom | Synonyms: psilocybin |
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| (noun) a substituted tryptamine alkaloid and a serotonergic psychedelic substance, present in most psychedelic mushrooms together with its phosphorylated counterpart psilocybin. | Synonyms: psilocine, psilocyn, psilotsin |
| psilocine | (noun) a substituted tryptamine alkaloid and a serotonergic psychedelic substance, present in most psychedelic mushrooms together with its phosphorylated counterpart psilocybin. | Synonyms: psilocin, psilocyn, psilotsin |
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| psilocybin | (noun) a hallucinogenic compound obtained from a mushroom | Synonyms: psilocin |
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| psilocyn | (noun) a substituted tryptamine alkaloid and a serotonergic psychedelic substance, present in most psychedelic mushrooms together with its phosphorylated counterpart psilocybin. | Synonyms: psilocin, psilocine, psilotsin |
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| psilomelane | (noun) a mineral consisting of hydrated basic oxide of manganese and barium; a source of manganese | - |
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| psilophyte | (noun) any plant of the order Psilophytales: a savannah plant | - |
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| psilophyton | (noun) any plant or fossil of the genus Psilophyton | - |
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| psilosis | (noun) falling out of hair | - |
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| (noun) a chronic disorder that occurs in tropical and non-tropical forms and in both children and adults; nutrients are not absorbed; symptoms include foul-smelling diarrhea and emaciation | Synonyms: sprue, tropical sprue |
| psilotsin | (noun) a substituted tryptamine alkaloid and a serotonergic psychedelic substance, present in most psychedelic mushrooms together with its phosphorylated counterpart psilocybin. | Synonyms: psilocin, psilocine, psilocyn |
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| psittacosaur | (noun) primitive dinosaur actually lacking horns and having only the beginning of a frill; long hind limbs and short forelimbs; may have been bipedal | Synonyms: psittacosaurus |
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| psittacosaurus | (noun) primitive dinosaur actually lacking horns and having only the beginning of a frill; long hind limbs and short forelimbs; may have been bipedal | Synonyms: psittacosaur |
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| psittacosis | (noun) infectious disease of birds | Synonyms: parrot disease |
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| (noun) an atypical pneumonia caused by a rickettsia microorganism and transmitted to humans from infected birds | Synonyms: ornithosis, parrot fever |
| psoas | (noun) either of two muscles of the abdomen and pelvis that flex the trunk and rotate the thigh | - |
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| psocid | (noun) small winged insect living on the bark and leaves of trees and feeding on e.g. fungi and decaying plant matter | - |
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| psoriasis | (noun) a chronic skin disease characterized by dry red patches covered with scales; occurs especially on the scalp and ears and genitalia and the skin over bony prominences | - |
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| psyche | (noun) that which is responsible for one's thoughts, feelings, and conscious brain functions; the seat of the faculty of reason | Synonyms: brain, head, mind, nous |
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| (noun) the immaterial part of a person; the actuating cause of an individual life | Synonyms: soul |
| psychedelia | (noun) the subculture of users of psychedelic drugs | - |
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| psychiatrist | (noun) a physician who specializes in psychiatry | Synonyms: head-shrinker, shrink |
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| psychiatry | (noun) the branch of medicine dealing with the diagnosis and treatment of mental disorders | Synonyms: psychological medicine, psychopathology |
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| psychic | (noun) a person apparently sensitive to things beyond the natural range of perception | - |
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| psycho | (noun) a person afflicted with psychosis | Synonyms: psychotic, psychotic person |
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| psychoanalysis | (noun) a set of techniques for exploring underlying motives and a method of treating various mental disorders; based on the theories of Sigmund Freud | Synonyms: analysis, depth psychology |
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| psychoanalyst | (noun) a licensed practitioner of psychoanalysis | Synonyms: analyst |
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| psychobabble | (noun) using language loaded with psychological terminology | - |
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| psychodid | (noun) a fly of the family Psychodidae | - |
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| psychodynamics | (noun) the branch of social psychology that deals with the processes and emotions that determine psychology and motivation | - |
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| (noun) the interrelation of conscious and unconscious processes and emotions that determine personality and motivation | - |
| psychogenesis | (noun) a general term for the origin and development of almost any aspect of the mind | - |
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| (noun) the development in the life of an individual of some disorder that is caused by psychological rather than physiological factors | - |
| psychographics | (noun) market research or statistics classifying population groups according to psychological variables (as attitudes, values, or fears); also: variables or trends identified through such research. | - |
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| psychokinesis | (noun) the power to move something by thinking about it without the application of physical force | Synonyms: telekinesis |
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| psycholinguist | (noun) a person (usually a psychologist but sometimes a linguist) who studies the psychological basis of human language | - |
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| psycholinguistics | (noun) the branch of cognitive psychology that studies the psychological basis of linguistic competence and performance | - |
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| psychologist | (noun) a scientist trained in psychology | - |
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| psychology | (noun) the science of mental life | Synonyms: psychological science |
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| psychomachy | (noun) a conflict of the soul (as with the body or between good and evil). | - |
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| psychometrics | (noun) any branch of psychology concerned with psychological measurements | Synonyms: psychometrika, psychometry |
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| psychometrika | (noun) any branch of psychology concerned with psychological measurements | Synonyms: psychometrics, psychometry |
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| psychometry | (noun) any branch of psychology concerned with psychological measurements | Synonyms: psychometrics, psychometrika |
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| psychoneurosis | (noun) a mental or personality disturbance not attributable to any known neurological or organic dysfunction | Synonyms: neurosis, neuroticism |
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| psychoneurotic | (noun) a person suffering from neurosis | Synonyms: mental case, neurotic |
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| psychonomics | (noun) the branch of psychology that uses experimental methods to study psychological issues | Synonyms: experimental psychology |
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| psychopath | (noun) someone with a sociopathic personality; a person with an antisocial personality disorder (`psychopath' was once widely used but has now been superseded by `sociopath') | Synonyms: sociopath |
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| psychopathology | (noun) the branch of medicine dealing with the diagnosis and treatment of mental disorders | Synonyms: psychiatry, psychological medicine |
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| (noun) the branch of psychology concerned with abnormal behavior | Synonyms: abnormal psychology |
| psychopathy | (noun) any disease of the mind; the psychological state of someone who has emotional or behavioral problems serious enough to require psychiatric intervention | Synonyms: mental disease, mental illness |
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| psychopharmacology | (noun) the study of drugs that affect the mind | - |
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| psychophysicist | (noun) a psychologist trained in psychophysics | - |
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| psychophysics | (noun) the branch of psychology concerned with quantitative relations between physical stimuli and their psychological effects | - |
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| psychophysiology | (noun) the branch of psychology that is concerned with the physiological bases of psychological processes | Synonyms: neuropsychology, physiological psychology |
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| psychopomp | (noun) a conductor of souls to the afterworld | - |
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| psychosexuality | (noun) the mental representation of sexual activities | - |
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| psychosis | (noun) any severe mental disorder in which contact with reality is lost or highly distorted | - |
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| psychosurgery | (noun) brain surgery on human patients intended to relieve severe and otherwise intractable mental or behavioral problems | - |
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| psychotherapeutics | (noun) the branch of psychiatry concerned with psychological methods | Synonyms: mental hygiene, psychotherapy |
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| psychotherapist | (noun) a therapist who deals with mental and emotional disorders | Synonyms: clinical psychologist |
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| psychotherapy | (noun) the treatment of mental or emotional problems by psychological means | - |
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| (noun) the branch of psychiatry concerned with psychological methods | Synonyms: mental hygiene, psychotherapeutics |
| psychotic | (noun) a person afflicted with psychosis | Synonyms: psycho, psychotic person |
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| psychrometer | (noun) a hygrometer consisting of a dry-bulb thermometer and a wet-bulb thermometer; their difference indicates the dryness of the surrounding air | - |
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| psylla | (noun) small active cicada-like insect with hind legs adapted for leaping; feeds on plant juices | Synonyms: jumping plant louse, psyllid |
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| psyllid | (noun) small active cicada-like insect with hind legs adapted for leaping; feeds on plant juices | Synonyms: jumping plant louse, psylla |
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| psyllium | (noun) plantain of Mediterranean regions whose seeds swell and become gelatinous when moist and are used as a mild laxative | Synonyms: fleawort, Plantago psyllium, Spanish psyllium |
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| psyop | (noun) military actions designed to influence the perceptions and attitudes of individuals, groups, and foreign governments | Synonyms: psychological operation |
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