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Shapur II

(Encyclopedia)Shapur II or Sapor II, 310–79, king of Persia (310–79), of the Sassanid, or Sassanian, dynasty. He was the posthumous son of Hormuz II and therefore was born king. His long reign was marked by gre...

Carlos the Jackal

(Encyclopedia)Carlos the Jackal, pseud. of the revolutionary and international terrorist Ilich Ramírez Sánchez, 1949–, b. Caracas, Venezuela. Son of an affluent Marxist lawyer, he joined the Communist party at ...

Requesens, Luis de Zúñiga y

(Encyclopedia)Requesens, Luis de Zúñiga y lwēs dā tho͞oˈnyēgä ē rākāsānsˈ [key], 1528–76, Spanish general. Born into the highest nobility of Spain, he held high governmental and diplomatic posts and ...

bow and arrow

(Encyclopedia)bow and arrow, weapon consisting of two parts; the bow is made of a strip of flexible material, such as wood, with a cord linking the two ends of the strip to form a tension from which is propelled th...

chaos theory

(Encyclopedia)chaos theory, in mathematics, physics, and other fields, a set of ideas that attempts to reveal structure in aperiodic, unpredictable dynamic systems such as cloud formation or the fluctuation of biol...

eutrophication

(Encyclopedia)eutrophication yo͞otrōˌfĭkāˈshən [key], aging of a lake by biological enrichment of its water. In a young lake the water is cold and clear, supporting little life. With time, streams draining i...

naturalism, in philosophy

(Encyclopedia)naturalism, in philosophy, a position that attempts to explain all phenomena and account for all values by means of strictly natural (as opposed to supernatural) categories. The particular meaning of ...

Merleau-Ponty, Maurice

(Encyclopedia)Merleau-Ponty, Maurice mōrēsˈ mĕrlōˈ-pôNtēˈ [key], 1908–61, French philosopher. He graduated (1931) from the École normale supérieure, Paris, and after World War II taught at the Univ. of...

Lotze, Rudolf Hermann

(Encyclopedia)Lotze, Rudolf Hermann ro͞oˈdôlf hĕrˈmän lōˈtsə [key], 1817–81, German philosopher and psychologist. After studying medicine and philosophy at Leipzig, he was lecturer in both departments an...

parathyroid hormone

(Encyclopedia)parathyroid hormone or parathormone, a hormone secreted by the parathyroid glands that regulates the metabolism of calcium and phosphate in the body. It has been purified extensively and appears to be...