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premenstrual syndrome

(Encyclopedia)premenstrual syndrome (PMS), any of various symptoms experienced by women of childbearing age in the days immediately preceding menstruation. It is most common in women in their twenties and thirties....

Maria Christina, 1806–78, queen of Spain

(Encyclopedia)Maria Christina märēˈä krēstēˈnä [key], 1806–78, queen of Spain, daughter of Francis I of the Two Sicilies. The fourth wife of Ferdinand VII, she persuaded him to confirm (1833) the original...

rhythm, biological

(Encyclopedia)rhythm, biological, or biorhythm, cyclic pattern of physiological changes or changes in activity in living organisms, most often synchronized with daily, monthly, or annual cyclical changes in the env...

State, United States Department of

(Encyclopedia)State, United States Department of, executive department of the federal government responsible, under the President's direction, for the making and execution of American foreign policy. Before and ...

adolescence

(Encyclopedia)adolescence, time of life from onset of puberty to full adulthood. The exact period of adolescence, which varies from person to person, falls approximately between the ages 12 and 20 and encompasses b...

Peter, epistles of the New Testament

(Encyclopedia)Peter, two letters of the New Testament, classified among the Catholic (or General) Epistles. Each opens with a statement of authorship by the apostle St. Peter. First Peter, the longer book, is addre...

Vermigli, Pietro Martire

(Encyclopedia)Vermigli, Pietro Martire pyĕˈtrō märtēˈrā vārmēˈlyē [key], 1500–1562, Italian Protestant reformer, also known as Peter Martyr. He joined the Augustinian canons and in that order received ...

lake, body of water

(Encyclopedia)lake, inland body of standing water occupying a hollow in the earth's surface. The study of lakes and other freshwater basins is known as limnology. Lakes are of particular importance since they act a...

William I, king of England

(Encyclopedia)William I or William the Conqueror, 1027?–1087, king of England (1066–87). Earnest and resourceful, William was not only one of the greatest of English monarchs but a pivotal figure in European hi...

senility

(Encyclopedia)senility sənilˈətē [key], deterioration of body and mind associated with old age. Indications of old age vary in the time of their appearance. Stooped posture, wrinkled skin, decrease in muscle st...