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bauxite

(Encyclopedia)bauxite bôkˈsīt, bŏkˈ– [key], mixture of hydrated aluminum oxides usually containing oxides of iron and silicon in varying quantities. A noncrystalline substance formerly thought to be a minera...

Taxco

(Encyclopedia)Taxco täsˈkō [key], town (1990 pop. 43,836), Guerrero state, S Mexico. Founded in 1529 as a silver-mining community, Taxco was also an important stop between Mexico City and Acapulco in Spanish col...

Spectral Classes for Main Sequence Stars (table)

(Encyclopedia)Characteristics of Spectral Classes for Main Sequence Stars ...

Ahaz

(Encyclopedia)Ahaz āˈhăz [key], d. c.727 b.c., king of Judah (c.731–727 b.c.), son of Jotham. His reign marked the end of the real independence of Judah. A coalition of Pekah of Israel and Rezin of Syria attac...

bloodletting

(Encyclopedia)bloodletting, also called bleeding, practice of drawing blood from the body in the treatment of disease. General bloodletting consists of the abstraction of blood by incision into an artery (arterioto...

zinnia

(Encyclopedia)zinnia, any species of the genus Zinnia of the family Asteraceae (aster family), native chiefly to Mexico, though some range as far north as Colorado and as far south as Guatemala. The common zinnia o...

beryl

(Encyclopedia)beryl bĕrˈĭl [key], mineral, a silicate of beryllium and aluminum, Be3Al2Si6O18, extremely hard, occurring in hexagonal crystals that may be of enormous size and are usually white, yellow, green, b...

Thorfinn Karlsefni

(Encyclopedia)Thorfinn Karlsefni thôrˈfĭn kärlˈsĕvnē [key], fl. 1002–15, Norse leader of an attempt to colonize North America. He appeared in Greenland in 1002 and married Gudrid, widow of one of the sons ...

mulberry

(Encyclopedia)CE5 Red mulberry, Morus rubra mulberry, common name for the Moraceae, a family of deciduous or evergreen trees and shrubs, often climbing, mostly of pantropical distribution, and characterized by ...

Hertzsprung-Russell diagram

(Encyclopedia)CE5 The Hertzsprung-Russell diagram shows the relation between the luminosity and surface temperature (which is related to spectral class, or color) of the stars in the Milky Way. Most stars fall a...