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Rh factor

(Encyclopedia)Rh factor, protein substance present in the red blood cells of most people, capable of inducing intense antigenic reactions. The Rh, or rhesus, factor was discovered in 1940 by K. Landsteiner and A. S...

Creek

(Encyclopedia)Creek, Native North American confederacy. The peoples forming it were mostly of the Muskogean branch of the Hokan-Siouan linguistic stock (see Native American languages). The Creek received their name...

flax

(Encyclopedia)flax, common name for members of the Linaceae, a family of annual herbs, especially members of the genus Linum, and for the fiber obtained from such plants. The flax of commerce (several varieties of ...

wings

(Encyclopedia)CE5 A. Structure of a bird wing B. Structure of a bat wing wings, flight organs of the bird, the bat, and the insect. Birds' wings are pectoral appendages that are basically the same in skeletal...

wall

(Encyclopedia)wall, in architecture, protective, enclosing, or dividing vertical structure. Its thickness is determined by the material, height, and stress. It may be of studding and lath, either boarded or plaster...

Pliocene epoch

(Encyclopedia)Pliocene epoch plīˈəsēn [key], fifth epoch of the Cenozoic era of geologic time (see Geologic Timescale, tablegeologic timescale, table), from 5.1 to 2 million years ago. By the beginning of the P...

camel

(Encyclopedia)camel, ruminant mammal of the family Camelidae. The family consists of three genera, the true camels of Asia (genus Camelus); the wild guanaco and the domesticated alpaca and llama, all of South Ameri...

olive

(Encyclopedia)olive, common name for the Oleaceae, a family of trees and shrubs (including climbing forms) of warm temperate climates and of the Old World tropics, especially Asia and the East Indies. Many are popu...

boa

(Encyclopedia)boa bōˈə [key], name for live-bearing constrictor snakes of the family Boidae, found mostly in the Americas. This family, which also comprises the egg-laying pythons of the Old World, includes the ...

beetle

(Encyclopedia)beetle, common name for insects of the order Coleoptera, which, with more than 300,000 described species, is the largest of the insect orders. Beetles have chewing mouthparts and well-developed antenn...