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poliomyelitis

(Encyclopedia)poliomyelitis pōˌlēōmīˌəlīˈtĭs [key], polio, or infantile paralysis, acute viral infection, mainly of children but also affecting older persons. Historically, there were three immunologic ty...

United Nations Members (table)

(Encyclopedia)United Nations Members

ivory

(Encyclopedia)ivory, type of dentin present only in the tusks of the elephant. Ivory historically has been obtained mainly from Africa, where elephant tusks are larger than they are in Asia, the second major source...

Gambia, The, country, Africa

(Encyclopedia)CE5 Gambia, The gămˈbēə, gämˈ– [key], officially Republic of The Gambia, republic (2015 est. pop. 1,978,000), 4,361 sq mi (11,295 sq km), W Africa. It is bordered by the Atlantic Ocean on t...

Liberia

(Encyclopedia)CE5 Liberia lībērˈēə [key] [New Lat.,=place of freedom], officially Republic of Liberia, republic (2015 est. pop. 4,500,000), 43,000 sq mi (111,370 sq km), W Africa. Liberia fronts on the Atla...

Atlantic Ocean

(Encyclopedia)CE5 Atlantic Ocean [Lat.,=of Atlas], second largest ocean (c.31,800,000 sq mi/82,362,000 sq km; c.36,000,000 sq mi/93,240,000 sq km with marginal seas). The North Atlantic Ocean has some of the w...

leukemia

(Encyclopedia)leukemia lo͞okēˈmēə [key], cancerous disorder of the blood-forming tissues (bone marrow, lymphatics, liver, spleen) characterized by excessive production of immature or mature leukocytes (white b...

worm

(Encyclopedia)worm, common name for various unrelated invertebrate animals with soft, often long and slender bodies. Members of the phylum Platyhelminthes, or the flatworms, are the most primitive; they are general...

São Tomé and Principe

(Encyclopedia)CE5 São Tomé and Principe prēnˈsēpə [key], officially Democratic Republic of São Tomé and Principe, republic (2015 est. pop. 196,000), 372 sq mi (964 sq km), W Africa, in the Gulf of Guinea...

turtle

(Encyclopedia)turtle, a reptile of the order Chelonia, with strong, beaked, toothless jaws and, usually, an armorlike shell. The shell normally consists of bony plates overlaid with horny shields. The upper portion...