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geologic timescale
(Encyclopedia) CE5 geologic timescale, a chronological scale of earth's history used to measure the relative or absolute age of any part of geologic time. Of the numerous timescales, the most…American Medical Association
(Encyclopedia) American Medical Association (AMA), professional physicians' organization (founded 1847). Its goals are to protect the interests of American physicians, advance public health, and…hundred
(Encyclopedia) hundred, in English history, a subdivision of a shire, first mentioned in the 10th cent. and surviving as a unit of local government into the 19th cent. It is thought that in origin…Altaic
(Encyclopedia) AltaicAltaicăltāˈĭk [key], subfamily of the Ural-Altaic family of languages (see Uralic and Altaic languages). Some scholars still consider Altaic an independent linguistic family.…Energy, United States Department of
(Encyclopedia) Energy, United States Department of, executive department of the federal government responsible for coordinating national activities relating to the production, regulation, marketing,…Health and Human Services, United States Department of
(Encyclopedia) Health and Human Services, United States Department of, federal executive department charged with administering government health programs. Successor to the Department of Health,…biology
(Encyclopedia) biology, the science that deals with living things. It is broadly divided into zoology, the study of animal life, and botany, the study of plant life. Subdivisions of each of these…home economics
(Encyclopedia) home economics, study of homemaking and the relation of the home to the community. Formerly limited to problems of food (nutrition and cookery), clothing, sewing, textiles, household…spectral class
(Encyclopedia) CE5 spectral class, in astronomy, a classification of the stars by their spectrum and luminosity. In 1885, E. C. Pickering began the first extensive attempt to classify the stars…Wittelsbach
(Encyclopedia) WittelsbachWittelsbachvĭˈtəlsbäkh [key], German dynasty that ruled Bavaria from 1180 until 1918. The family takes its name from the ancestral castle of Wittelsbach in Upper Bavaria. In…Trending
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