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acne

(Encyclopedia)acne, common inflammatory disease of the hair follicles and sebaceous glands characterized by blackheads, whiteheads, pustules, nodules and, in the more severe forms, by cysts and scarring. The lesion...

Guerrero, Vicente

(Encyclopedia)Guerrero, Vicente vēsānˈtā gār-rāˈrō [key], 1782–1831, Mexican revolutionist and president (Apr.–Dec., 1829). He fought under the command of Morelos y Pavón, spreading the revolution in t...

Mary of Guise

(Encyclopedia)Mary of Guise gēz [key], 1515–60, queen consort of James V of Scotland and regent for her daughter, Mary Queen of Scots. The daughter of Claude de Lorraine, duc de Guise, she was also known as Mary...

lime, in botany

(Encyclopedia)lime, in botany, small shrublike tree (Citrus aurantifolia) of the family Rutaceae (rue family), one of the citrus fruit trees, similar to the lemon but more spreading and irregular in growth. The tru...

volcano

(Encyclopedia)volcano, vents or fissures in the earth's crust through which gases, molten rock, or lava, and solid fragments are discharged. Their study is called volcanology. The term volcano is commonly applied b...

epidemic

(Encyclopedia)epidemic, outbreak of disease that affects a much greater number of people than is usual for the locality or that spreads to regions where it is ordinarily not present. A disease that tends to be rest...

Mixtec

(Encyclopedia)Mixtec mĭsˈtĕk [key], Native American people of Oaxaca, Puebla, and part of Guerrero, SW Mexico, one of the most important groups in Mexico. Although the Mixtec codices constitute the largest colle...

glacier

(Encyclopedia)glacier, moving mass of ice that survives year to year, formed by the compacting of snow into névé and then into granular ice and set in motion outward and downward by the force of gravity and the s...

Ionic order

(Encyclopedia)Ionic order īŏnˈĭk [key], one of the early orders of architecture. The spreading scroll-shaped capital is the distinctive feature of the Ionic order; it was primarily a product of Asia Minor, wher...

oceanography

(Encyclopedia)oceanography, study of the seas and oceans. The major divisions of oceanography include the geological study of the ocean floor (see plate tectonics) and features; physical oceanography, which is conc...