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Abu al-Abbas as-Saffah

(Encyclopedia)Abu al-Abbas as-Saffah äˈbo͞o äl-äbäsˈ äs-säfäˈ [key], d. 754, 1st Abbasid caliph (749–54). Raised to the caliphate by the armed might of Abu Muslim, he took the reign name as-Saffah [she...

Medusa, in Greek mythology

(Encyclopedia)Medusa mədo͞oˈsə [key], in Greek mythology, most famous of the three monstrous Gorgon sisters. She was once a beautiful woman, but she offended Athena, who changed her hair into snakes and made he...

Agre, Peter Courtland

(Encyclopedia)Agre, Peter Courtland, 1949–, American molecular biologist, b. Northfield, Minn., M.D. Johns Hopkins, 1974. From 1981 to 2005, Agre taught at Johns Hopkins in the departments of medicine and cell bi...

Caesalpinus, Andreas

(Encyclopedia)Caesalpinus, Andreas ändrĕˈä chāzälpēˈnō [key], 1519–1603, Italian botanist and physiologist. He was physician to Pope Clement VIII. He described, in part and as a theory only, the circulat...

Schleicher, Kurt von

(Encyclopedia)Schleicher, Kurt von, 1882–1934, German general. A leading Reichswehr (army) figure after World War I, Schleicher wielded great power in the years before Adolf Hitler came to power (1933). He was wa...

neoplasm

(Encyclopedia)neoplasm or tumor, tissue composed of cells that grow in an abnormal way. Normal tissue is growth-limited, i.e., cell reproduction is equal to cell death. Feedback controls limit cell division after a...

lungs

(Encyclopedia)lungs, elastic organs used for breathing in vertebrate animals, excluding most fish, which use gills, and a few amphibian species that respire through the skin. The word is sometimes applied to the re...

lamprey

(Encyclopedia)lamprey, name for several primitive marine and freshwater jawless fishes of the order Petromyzontiformes. As in the other jawless fish, the hagfish, the adult lamprey retains the notochord, the suppor...

diabetes

(Encyclopedia)diabetes or diabetes mellitus məlīˈtəs [key], chronic disorder of glucose (sugar) metabolism caused by inadequate production or use of insulin, a hormone produced in specialized cells (beta cells ...

du Plessix Gray, Francine

(Encyclopedia)du Plessix Gray, Francine, 1930–2019, French-American writer, b. Warsaw, studied Bryn Mawr, Black Mountain College, B.A. Barnard, 1952. She worked first as a writer and editor for radio and magazine...