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psi2 the name of the twenty-third letter of the Greek alphabet. [2 definitions]
psilocybin a solid, crystalline hallucinogenic obtained from a certain type of mushroom.
psi particle an unstable meson that is thought to be composed of a quark and its antiparticle.
psittacosis a viral infection of birds that can be transmitted to humans as an illness similar to pneumonia.
psoriasis a chronic disease of the skin that causes dry, scaly patches.
psst used to attract the attention.
PST abbreviation of "Pacific Standard Time," the standard time used in the Pacific Coast region of the United States, eight hours behind Greenwich time.
psych (informal) to intimidate with psychological pressure; make uneasy or nervous (usu. fol. by out). [3 definitions]
psyche the human soul or spirit. [3 definitions]
psychedelic of, relating to, or producing heightened or distorted sensory perceptions, hallucinations, and sometimes extreme behavioral patterns. [3 definitions]
psychiatrist a doctor who specializes in treating mental and emotional disorders.
psychiatry the medical science or practice of diagnosing, treating, and preventing mental and emotional disorders.
psychic of, caused by, or pertaining to nonphysical, spiritual, or supernatural processes or influences. [4 definitions]
psycho (slang) a psychopath. [2 definitions]
psycho- mind. [2 definitions]
psychoactive of a chemical agent or drug, affecting or capable of affecting the mind or mental functions.
psychoanalysis a method of studying and treating mental disorders and illnesses by analyzing dreams, early childhood memories, and other experiences as keys to the subconscious mind.
psychoanalyst one who specializes in the study and techniques of psychoanalysis.
psychoanalyze to subject to psychoanalysis.
psychobabble (informal) talk or writing that uses the language of psychology in a superficial or irrelevant way.
psychobiology the branch of biology that deals with the interactions between the mental processes and the body of the individual. [2 definitions]