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Déby, Idriss

(Encyclopedia)Déby, Idriss ĭdrĭsˈ dĕbēˈ [key], 1952–2021, Chadian military and political leader, president ...

cytosine

(Encyclopedia)cytosine sīˈtōsēnˌ [key], organic base of the pyrimidine family. It was isolated from the nucleic acid of calf thymus tissue in 1894. A suggested structure for cytosine, published in 1903, was co...

Americanization

(Encyclopedia)Americanization, term used to describe the movement during the first quarter of the 20th cent. whereby the immigrant in the United States was induced to assimilate American speech, ideals, traditions,...

legion

(Encyclopedia)legion, large unit of the Roman army. It came into prominence c.400 b.c. It originally consisted of 3,000 to 4,000 men drawn into eight ranks: the first six ranks, called hoplites, were heavily armed,...

water beetle

(Encyclopedia)water beetle, name for aquatic beetles of several families. They should not be confused with water bugs, which are true bugs (order Hemiptera). The predaceous diving beetles (family Dytiscidae) are a ...

Boolean algebra

(Encyclopedia)Boolean algebra bo͞oˈlēən [key], an abstract mathematical system primarily used in computer science and in expressing the relationships between sets (groups of objects or concepts). The notational...

zaibatsu

(Encyclopedia)zaibatsu zīˈbätso͞o [key] [Jap.,=money clique], the great family-controlled banking and industrial combines of modern Japan. The leading zaibatsu (called keiretsu after World War II) are Mitsui, M...

tektite

(Encyclopedia)tektite tĕktīt [key], naturally occurring, silica-rich (65%–80% SiO2) glass resembling obsidian and sometimes shale, and is normally jet black to olive green. They appear as small rounded or elong...

diuretic

(Encyclopedia)diuretic dīˌyərĕtˈĭk [key], drug used to increase urine formation and output. Diuretics are prescribed for the treatment of edema (the accumulation of excess fluids in the tissues of the body), ...

Doherty, Peter Charles

(Encyclopedia)Doherty, Peter Charles, 1940–, Australian immunologist, Ph.D., Univ. of Edinburgh, 1970. He was a research fellow at Australian National Univ. (1972–75), a professor at the Wistar Institute, Phila...