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Clement VII, pope

(Encyclopedia)Clement VII, c.1475–1534, pope (1523–34), a Florentine named Giulio de' Medici; successor of Adrian VI. He was the nephew of Lorenzo de' Medici and was therefore first cousin of Pope Leo X. In 151...

extinction

(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 the affected speci...

parthenogenesis

(Encyclopedia)parthenogenesis pärˌthənōjĕnˈəsĭs [key] [Gr.,=virgin birth], in biology, a form of reproduction in which the ovum develops into a new individual without fertilization. Natural parthenogenesis ...

transposing instrument

(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 of its natural s...

umbilical cord

(Encyclopedia)umbilical cord ŭmbĭlˈĭkəl [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. Its chief function is t...

vinegar

(Encyclopedia)vinegar, sour liquid consisting mainly of acetic acid and water, produced by the action of bacteria on dilute solutions of ethyl alcohol derived from previous yeast fermentation. The coloring and flav...

vortex

(Encyclopedia)vortex vôrˈtĕks [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 absence of friction w...

Bent's Fort

(Encyclopedia)Bent's Fort, trading post of the American West, on the Arkansas River in present-day SE Colorado, E of Rocky Ford and La Junta and several miles above the mouth of the Purgatoire. The trading company ...

workers' compensation

(Encyclopedia)workers' compensation, payment by employers for some part of the cost of injuries, or in some cases of occupational diseases, received by employees in the course of their work. The degree of responsib...

tarantula

(Encyclopedia)tarantula tərănˈchələ [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 Australia. The body of ...