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yucca

(Encyclopedia) yuccayuccayŭkˈə [key], any plant of the genus Yucca, stiff-leaved stemless or treelike succulents of the family Liliaceae (lily family), native chiefly to the tablelands of Mexico and…

Zeeman effect

(Encyclopedia) Zeeman effect, splitting of a single spectral line (see spectrum) into a group of closely spaced lines when the substance producing the single line is subjected to a uniform magnetic…

bonobo

(Encyclopedia) bonobo, smaller of two species of chimpanzee, genus Pan. Whereas the common chimpanzee, P. troglodytes, lives in forests across most of equatorial Africa, the bonobo, P. paniscus (…

celestial mechanics

(Encyclopedia) celestial mechanics, the study of the motions of astronomical bodies as they move under the influence of their mutual gravitation. Celestial mechanics analyzes the orbital motions of…

lubrication

(Encyclopedia) lubrication, introduction of a substance between the contact surfaces of moving parts to reduce friction and to dissipate heat. A lubricant may be oil, grease, graphite, or any…

deafness

(Encyclopedia) deafness, partial or total lack of hearing. It may be present at birth (congenital) or may be acquired at any age thereafter. A person who cannot detect sound at an amplitude of 20…

forestry

(Encyclopedia) forestry, the management of forest lands for wood, water, wildlife, forage, and recreation. Because the major economic importance of the forest lies in wood and wood products, forestry…

colloid

(Encyclopedia) colloidcolloidkŏlˈoid [key] [Gr.,=gluelike], a mixture in which one substance is divided into minute particles (called colloidal particles) and dispersed throughout a second substance…

isoleucine

(Encyclopedia) CE5 isoleucineisoleucineīˌsəl&oomacr;ˈsēn [key], organic compound, one of the 20 amino acids commonly found in animal proteins. Only the l-stereoisomer appears in mammalian…

image

(Encyclopedia) image, in optics, likeness or counterpart of an object produced when rays of light coming from that object are reflected from a mirror or are refracted by a lens. An image of an object…