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liquid air

(Encyclopedia)liquid air, ordinary air that has been liquefied by compression and cooling to extremely low temperatures (see liquefaction). Its commercial preparation involves purification by washing to remove solu...

Lloyd's

(Encyclopedia)Lloyd's, London insurance underwriting corporation of many separate syndicates; often called Lloyd's of London. Founded in the late 17th cent. by a group of merchants, shipowners, and insurance broker...

López, Francisco Solano

(Encyclopedia)López, Francisco Solano lōˈpās [key], 1826?–1870, president of Paraguay (1862–70). He was the son of Carlos Antonio López, who made him a brigadier general at 18. Appointed head of a diploma...

meristem

(Encyclopedia)meristem mĕrˈistĕmˌ [key], a specialized section of plant tissue characterized by cell division and growth. Much of the mature plant's growth is provided by meristems. Apical meristems found at th...

rowing

(Encyclopedia)rowing, the art of propelling a boat by means of oars operated by hand. Boats propelled by oars (e.g., the galley) were used in ancient times for both war and commerce. Rowing is now generally used on...

thyroxine

(Encyclopedia)thyroxine thīrŏkˈsēn [key], substance secreted by the thyroid gland. The hormone thyroxine forms by combining the amino acid tyrosine with iodine. Complexed to a protein, it is stored in the folli...

Cheng Ho

(Encyclopedia)Cheng Ho or Zheng He both: jŭngˈ ho͝oˈ [key], 1371–c.1433, admiral, diplomat, and explorer during China's Ming dynasty. At 10 he was captured by Chinese troops in Yunnan, castrated, and sent int...

glaucoma

(Encyclopedia)glaucoma glôkōˈmə [key], ocular disorder characterized by pressure within the eyeball caused by an excessive amount of aqueous humor (the fluid substance filling the eyeball). This causes pressure...

Uribe Vélez, Álvaro

(Encyclopedia)Uribe Vélez, Álvaro, 1952–, Colombian politician. A lawyer from a wealthy cattle-ranching family, he held a number of government posts before becoming mayor of Medellín in 1982; he was later a Co...

ejido

(Encyclopedia)ejido āhēˈᵺō [key] [Span.,=common land], in Mexico, agricultural land expropriated from large private holdings and redistributed to communal farms. Communal ownership of land had been widely pra...