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Iowa, river, United States

(Encyclopedia)Iowa, river, 329 mi (529 km) long, rising in the lakes of N Iowa and flowing SE to the Mississippi River, SE Iowa; Cedar River (300 mi/483 km long) is its chief tributary. A power dam crosses the gorg...

hectare

(Encyclopedia)hectare hĕkˈtâr, –tär [key], abbr. ha, unit of area in the metric system, equal to 10,000 sq m, or about 2.47 acres. ...

gold standard

(Encyclopedia)gold standard: see bimetallism; international monetary system; money. ...

astronomical unit

(Encyclopedia)astronomical unit (AU), mean distance between the earth and sun; one AU is c.92,960,000 mi (149,604,970 km). The astronomical unit is the principal unit of measurement within the solar system, e.g., M...

kelvin

(Encyclopedia)kelvin, abbr. K, official name in the International System of Units (SI) for the degree of temperature as measured on the Kelvin temperature scale. ...

Sivan

(Encyclopedia)Sivan sēvänˈ [key], in the Jewish calendar, the third month (or ninth month, depending upon the system of reckoning). Esther 8.9; Baruch 1.8. ...

center

(Encyclopedia)center, in politics, a party following a middle course. The term was first used in France in 1789, when the moderates of the National Assembly sat in the center of the hall. It can refer to a separate...

Oswego, river, United States

(Encyclopedia)Oswego, river, 23 mi (37 km) long, formed by the confluence of the Oneida and the Seneca rivers, central N.Y., NW of Syracuse and flowing NW to Lake Ontario at Oswego. It has been canalized and incorp...

chemical equilibrium

(Encyclopedia)chemical equilibrium, state of balance in which two opposing reversible chemical reactions proceed at constant equal rates with no net change in the system. For example, when hydrogen gas, H2, and iod...

immunology

(Encyclopedia)immunology, branch of medicine that studies the response of organisms to foreign substances, e.g., viruses, bacteria, and bacterial toxins (see immunity). Immunologists study the tissues and organs of...