| | - permittivity
- a universal electric constant appearing in the mathematical formulation of two fundamental phenomena, the existence of a physical force between two separated electric charges (see Coulomb force), and the modification of the properties of an electric field attending the introduction ...
- permutations and combinations
- the various ways in which objects from a set may be selected, generally without replacement, to form subsets. This selection of subsets is called a permutation when the order of selection is a factor, a combination when order is not ...
- Pernambuco
- estado ("state") of northeastern Brazil, situated near the eastern tip of the South American coastline's bulge into the Atlantic Ocean. It is bounded on the east by the Atlantic, on the south by the states of Alagoas and Bahia, ...
- pernicious anemia
- a slow-developing disease in which the production of red blood cells is impaired as the result of a defect in the body's ability to absorb vitamin B12. An absence of hydrochloric acid in gastric secretions (achlorhydria) is also characteristic. Pernicious ...
- Pernik
- town, west-central Bulgaria. The town is located on the banks of the Struma River, 19 miles (31 km) southwest of Sofia. Originally a Bulgarian fortress whose function it was to repel the assaults of the Byzantine armies, Pernik was for ...
- peromelia
- congenital absence or malformation of the extremities, of rare occurrence until the thalidomide tragedy in the early 1960s. Peromelia is caused by errors in the formation and development of the limb bud from about the fourth to the eighth week ...
- Peron, Eva
- second wife of Argentine president Juan Peron, who, during her husband's first term as president (1946-52), became a powerful though unofficial political leader, revered by the lower economic classes.
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