(Encyclopedia) vortexvortexvôrˈtĕks [key], mass of fluid in whirling or rotary motion. To simplify the analysis, vortex motion usually describes motions in a frictionless fluid. In such cases the…
(Encyclopedia) transposing instrument, a musical instrument whose part in a score is written at a different pitch than that actually sounded. Such an instrument is usually referred to by the keynote…
(Encyclopedia) umbilical cordumbilical cordŭmbĭlˈĭkəl [key], cordlike structure about 22 in. (56 cm) long in the pregnant human female, extending from the abdominal wall of the fetus to the placenta…
(Encyclopedia) tarantulatarantulatərănˈchələ [key], name applied chiefly to species of the large, hairy spiders of the family Theraphosidae of North and South America, Africa, S and SE Asia, and…
(Encyclopedia) Teapot Dome, in U.S. history, oil reserve scandal that began during the administration of President Harding. In 1921, by executive order of the President, control of naval oil reserves…
(Encyclopedia) Tenure of Office Act, in U.S. history, measure passed on Mar. 2, 1867, by Congress over the veto of President Andrew Johnson; it forbade the President to remove any federal…
(Encyclopedia) extinction, in biology, disappearance of species of living organisms. Extinction usually occurs as a result of changed conditions to which the species is not suited. If no member of…
