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Drew, Charles Richard

(Encyclopedia)Drew, Charles Richard, 1904–50, African-American physician, b. Washington, D.C. A surgeon and a professor at Howard Univ. (1935–36; 1942–50), he developed a means of preserving blood plasma for ...

Basmachi

(Encyclopedia)Basmachi bäsmäˈchē [key], revolt against Communist rule in Central Asia by Muslims and bandits, 1917–30. The Basmachi fought a guerrilla war against the Red Army, leading uprisings in the Fergan...

leech

(Encyclopedia)leech, predacious or parasitic annelid worm of the class Hirudinea, characterized by a cylindrical or slightly flattened body with suckers at either end for attaching to prey. The leech, like other an...

Lepidodendron and Sigillaria

(Encyclopedia)Lepidodendron sĭjĭlârˈēə [key], two principal genera of an extinct group of primitive vascular trees. They dominated the forests of the early Carboniferous period until the ferns gained ascendan...

Hopper, Dennis Lee

(Encyclopedia) Hopper, Dennis Lee, 1936-2010, American filmmaker and actor, b. Dodge City, Ks. Hopper’s family relocated several times during his childhood, settli...

pigmentation

(Encyclopedia)pigmentation, name for the coloring matter found in certain plant and animal cells and for the color produced thereby. Pigmentation occurs in nearly all living organisms. Almost all plants synthesize ...

Grayson, Cary Travers

(Encyclopedia)Grayson, Cary Travers, 1878–1938, American naval officer and surgeon, b. Culpeper co., Va. As a physician he entered (1903) the U.S. navy, was graduated (1904) from the navy medical school, and afte...

Delaherche, Félix Auguste

(Encyclopedia)Delaherche, Félix Auguste fālēksˈ ōgüstˈ dəläârshˈ [key], 1857–1940, French potter. He is considered the greatest ceramist since Bernard Palissy. Working alone in the village of La Chapel...

Doctrine of Signatures

(Encyclopedia)Doctrine of Signatures, the concept that the key to humanity's use of various plants was indicated by the form of the plant. The red sap of the bloodroot (Sanguinaria canadensis), for instance, was be...

Clarksville

(Encyclopedia)Clarksville, city (2020 pop. 166,722), seat of Montgomery co., NW Tenn., on the Cumberland and Red rivers, in a farm, livestock, and tobacco region; pla...