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nursery

(Encyclopedia)nursery, in horticulture, an establishment or area for the propagation, breeding, and early cultivation of plants. In North America the term nursery originally specified a place where hardy woody plan...

bean

(Encyclopedia)bean, name applied to the seeds of leguminous trees and shrubs and to various leguminous plants of the family Leguminosae (pulse family) with edible seeds or seed pods (legumes). The genera and specie...

gneiss

(Encyclopedia)gneiss nīs [key], coarse-grained, imperfectly foliated, or layered, metamorphic rock. Gneiss is characterized by alternating light and dark bands differing in mineral composition and having coarser g...

magnesia, chemical compound

(Encyclopedia)magnesia, common name for the chemical compound magnesium oxide, MgO. It occurs as colorless, cubic crystals. It is refractory, melting at about 2,800℃. It is very slightly soluble in pure water but...

magnetite

(Encyclopedia)magnetite măgˈnətīt [key], lustrous black, magnetic mineral, Fe3O4. It occurs in crystals of the cubic system, in masses, and as a loose sand. It is one of the important ores of iron (magnetic iro...

Damavand

(Encyclopedia)Damavand or Demavend both: dĕmˈəvĕnd [key], volcanic cone, 18,606 ft (5,671 m) high, in the Elburz range, N Iran. A permanently snow-covered volcano of recent geologic origin, it emits gases and s...

chalcopyrite

(Encyclopedia)chalcopyrite pīrīˈtēz, pə– [key], brass-yellow mineral, sometimes with an iridescent tarnish. It is a sulfide of copper and iron, CuFeS2 . It crystallizes in the tetragonal system but is usua...

Eskişehir

(Encyclopedia)Eskişehir ĕskēˈshĕhērˌ [key], city, capital of Eskişehir prov., W central Turkey. An ...

polychlorinated biphenyl

(Encyclopedia)polychlorinated biphenyl or PCB, any of a group of organic compounds originally widely used in industrial processes but later found to be dangerous environmental pollutants. Polychlorinated biphenyl i...

world soul

(Encyclopedia)world soul, Lat. anima mundi, in philosophy, term denoting a universal spirit or soul that functions as an organizing principle. While many early Greek philosophers saw the world as of one principle, ...