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microelectronics

(Encyclopedia)microelectronics, branch of electronic technology devoted to the design and development of extremely small electronic devices that consume very little electric power. Although the term is sometimes us...

number theory

(Encyclopedia)number theory, branch of mathematics concerned with the properties of the integers (the numbers 0, 1, −1, 2, −2, 3, −3, …). An important area in number theory is the analysis of prime number...

ophthalmology

(Encyclopedia)ophthalmology ŏfˌthălmŏlˈəjē [key], branch of medicine specializing in the anatomy, function and diseases of the eye. Ophthalmologists specialize in the medical and surgical treatment of eye di...

mineral

(Encyclopedia)mineral, inorganic substance occurring in nature, having a characteristic and homogeneous chemical composition, definite physical properties, and, usually, a definite crystalline form. A few of the mi...

Wichita, indigenous people of North America

(Encyclopedia)Wichita wĭchˈĭtô [key], Native North Americans whose language belongs to the Caddoan branch of the Hokan-Siouan linguistic stock (see Native American languages). They formerly occupied central Kan...

Yekaterinburg

(Encyclopedia)Yekaterinburg or Ekaterinburg svyĭrdlôfskˈ [key], city (1989 pop. 1,365,000), capital of the Sverdlovsk region and the administrative center of the Ural federal district, E European Russia, in the ...

Bhopal

(Encyclopedia)Bhopal bōˈpäl [key], former principality, Madhya Pradesh state, central India. A region of rolling downs and thickly forested hills, it is predominantly agricultural. Its Buddhist monuments include...

zoology

(Encyclopedia)zoology, branch of biology concerned with the study of animal life. From earliest times animals have been vitally important to man; cave art demonstrates the practical and mystical significance animal...

Utrecht , city, Netherlands

(Encyclopedia)Utrecht, city (1994 pop. 234,106), capital of Utrecht prov., central Netherlands, on a branch of the Lower Rhine (Neder Rijn) River. It is a transportation, financial, and industrial center. Manufactu...

Tlingit

(Encyclopedia)Tlingit tlĭngˈgĭt [key], group of related Native North American tribes, speaking a language that forms a branch of the Nadene linguistic stock (see Native American languages). The 14 divisions of t...