PI
In medicine, not a private investigator but a principal investigator, the person who directs a research project or program.
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- Pia mater
One of the meninges, the pia mater is the delicate innermost membrane enveloping the brain and spinal cord. It is known informally as the pia.
- Pianist's cramp
A dystonia that affects the muscles of the hand and sometimes the forearm, and that only occurs when one plays the piano or another keyboard instrument. Similar focal dystonias have also been called writer’s cramp, typist’s cramp, musician’s cramp, and golfer’s cramp.
- Pica
A craving for something that is not normally regarded as nutritive, such as dirt, clay, paper, or chalk. Pica is a classic clue to iron deficiency in children, and it may also occur with zinc deficiency. Pica is also seen as a symptom in several neurobiological disorders, including autism and Tourette’s syndrome, and it is […]
- Pick disease
A form of dementia characterized by a slowly progressive deterioration of social skills and changes in personality leading to impairment of intellect, memory, and language. The common core of symptoms includes loss of memory, lack of spontaneity, difficulty in thinking or concentrating, and disturbances of speech. Other symptoms include gradual emotional dullness, loss of moral […]
- Pickwickian syndrome
The combination of obesity, somnolence (sleepiness), hypoventilation (underbreathing), and plethoric (red) face. The syndrome is so named because of the “fat and red-faced boy in a state of somnolency” that Charles Dickens described in his novel, The Pickwick Papers. (The same boy is thought by some experts possibly to have had the Prader-Willi syndrome).