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sleep apnea

(Encyclopedia)sleep apnea, episodes of interrupted breathing during sleep. Obstructive sleep apnea is a common disorder in which relaxation of muscles in the throat repeatedly close off the airway during sleep; the...

Steelyard, Merchants of the

(Encyclopedia)Steelyard, Merchants of the, German hanse, or merchants guild, residing at the Steelyard on the Thames near the present Ironbridge Wharf at London, England. The merchants of the Hanseatic League in Lo...

Balaguer, Joaquín

(Encyclopedia)Balaguer, Joaquín (Joaquín Balaguer Ricardo) hwäkēnˈ bälägārˈ rēkärˈᵺō [key], 1907–2002, president of the Dominican Republic (1960–62, 1966–78, 1986–96). A lawyer by trade, he h...

pulse, in anatomy

(Encyclopedia)pulse, alternate expansion and contraction of artery walls as heart action varies blood volume within the arteries. Artery walls are elastic. Hence they become distended by increased blood volume duri...

molybdenum

(Encyclopedia)molybdenum məlĭbˈdənəm [key] [Gr.,=leadlike], metallic chemical element; symbol Mo; at. no. 42; at. wt. 95.96; m.p. about 2,617℃; b.p. about 4,612℃; sp. gr. 10.22 at 20℃; valence +2, +3, +4...

leaf

(Encyclopedia)CE5 Microscopic cross section of the leaf blade CE5 Types of leaves leaf, chief food-manufacturing organ of a plant, a lateral outgrowth of the growing point of stem. The typical leaf consist...

Douhet, Giulio

(Encyclopedia)Douhet, Giulio jo͞oˈlyō do͞oāˈ [key], 1869–1930, Italian military officer and early advocate of airpower. He was an early supporter of strategic bombing and the military superiority of air for...

encephalitis

(Encyclopedia)encephalitis ĕnsĕfˌəlīˈtəs [key], general term used to describe a diffuse inflammation of the brain and spinal cord, usually of viral origin, often transmitted by mosquitoes, in contrast to a b...

Huerta, Victoriano

(Encyclopedia)Huerta, Victoriano vēktōryäˈnō [key], 1854–1916, Mexican general and president (1913–14). He served under Porfirio Díaz. After the revolution of Francisco I. Madero (1911) he aided the new p...

Frederick William IV

(Encyclopedia)Frederick William IV, 1795–1861, king of Prussia (1840–61), son and successor of Frederick William III. A romanticist and a mystic, he conceived vague schemes of reform based on a revival of the m...