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estrogen

(Encyclopedia)CE5 estrogen ĕsˈtrəjən [key], any one of a group of hormones synthesized by the reproductive organs and adrenal glands in females and, in lesser quantities, in males. The estrogens cause the th...

minnow

(Encyclopedia)minnow, common name for the Cyprinidae, a large family of freshwater fish which includes the carp (Cyprinus carpio), and of which there are some 2,400 species. Minnows have soft-rayed fins and teeth i...

Morrison, Toni

(Encyclopedia)Morrison, Toni, 1931–2019, American writer, b. Lorain, Ohio, as Chloe Ardelia (later Anthony) Wofford; B.A. Howard Univ., 1953, M.F.A. Cornell, 1955. Her fiction is noted for its poetic language, lu...

steroids

(Encyclopedia)CE5 Two examples of steroids steroids, class of lipids having a particular molecular ring structure called the cyclopentanoperhydro-phenanthrene ring system. Steroids differ from one another in th...

Stockhausen, Karlheinz

(Encyclopedia)Stockhausen, Karlheinz kärlˈhīnts shtôkˈhouzən [key], 1928–2007, German composer, music theorist, and teacher; his first name also appears as Karl Heinz. He studied composition with Frank Mart...

Palestinian Authority

(Encyclopedia)Palestinian Authority (PA) or Palestinian National Authority, interim self-government body responsible for areas of the West Bank and Gaza Strip under Palestinian control. The terrritory is officially...

Wagner, Richard

(Encyclopedia)Wagner, Richard vägˈnər [key], 1813–83, German composer, b. Leipzig. Wagner's second wife, Cosima Wagner, 1837–1930, was the daughter of Liszt and the comtesse d'Agoult. From 1857 to 1870 sh...

space medicine

(Encyclopedia)space medicine, study of the medical and biological effects of space travel on living organisms. The principal aim is to discover how well and for how long humans can withstand the extreme conditions ...

moss, in botany

(Encyclopedia)CE5 Life cycle of a moss: A germinating spore forms a transitory branching structure on the soil surface, which develops into the conspicuous gametophyte, the familiar moss plant. Eggs and sperm ar...

steam engine

(Encyclopedia)CE5 Steam engine steam engine, machine for converting heat energy into mechanical energy using steam as a medium, or working fluid. When water is converted into steam it expands, its volume increa...