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heroin

(Encyclopedia)heroin hĕˈrəwən [key], opiate drug synthesized from morphine (see narcotic). Originally produced in 1874, it was thought to be not only nonaddictive but useful as a cure for respiratory illness an...

cocaine

(Encyclopedia)cocaine kōkānˈ, kōˈkān [key], alkaloid drug derived from the leaves of the coca shrub. A commonly abused illegal drug, cocaine has limited medical uses, most often in surgical applications that ...

brain

(Encyclopedia)CE5 Brain brain, the supervisory center of the nervous system in all vertebrates. It also serves as the site of emotions, memory, self-awareness, and thought. Brain research, now often referred ...

snake, in zoology

(Encyclopedia)snake, common name for an elongated, limbless reptile of the order Squamata, which also includes the xlizards. Most snakes live on the ground, but some are burrowers, arboreal, or aquatic; one group i...

Arthropoda

(Encyclopedia)Arthropoda ärthrŏpˈədə [key] [Gr.,=jointed feet], largest and most diverse animal phylum. The arthropods include crustaceans, insects, centipedes, millipedes, spiders, scorpions, and the extinct ...

South Sudan

(Encyclopedia)South Sudan so͞odănˈ [key], officially Republic of South Sudan, republic (2015 est. pop. 11,882,000), 248,777 sq mi (644,329 sq km), E Africa. South Sudan is bordered by Sudan (N), Ethiopia (E), Ke...

Mauritania

(Encyclopedia)CE5 Mauritania môrĭtāˈnēə [key], officially Islamic Republic of Mauritania, republic (2015 est. pop. 4,182,000), 397,953 sq mi (1,030,700 sq km), NW Africa. It borders on the Atlantic Ocean i...

Chad

(Encyclopedia)CE5 Chad chăd, chäd [key], officially Republic of Chad, republic (2020 est. pop. 16,425,864), ...

Senegal, country, Africa

(Encyclopedia)CE5 Senegal sĕnĭgôlˈ, sĕnˈĭgôl [key], officially Republic of Senegal, republic (2015 est. pop. 13,975,000), 76,124 sq mi (197,161 sq km), W Africa. It is bordered by the Atlantic Ocean in t...

Sudan

(Encyclopedia)CE5 Sudan so͞odănˈ [key], officially Republic of the Sudan, republic (2015 est. pop. 38,648,000), 718,723 sq mi (1,861,484 sq km), NE Africa. It borders on Egypt in the north, on the Red Sea in ...