Columbia Encyclopedia

Search results

424 results found

vision

(Encyclopedia)CE5 Optic nerve vision, physiological sense of sight by which the form, color, size, movements, and distance of objects are perceived. Defects of vision include astigmatism, color blindness, far...

Spinoza, Baruch

(Encyclopedia)Spinoza, Baruch or Benedict spinōˈzə [key], 1632–77, Dutch philosopher, b. Amsterdam. Politically, Spinoza and Hobbes again share assumptions about the social contract: Right derives from p...

interference

(Encyclopedia)CE5 Constructive interference: Two crests or two troughs meet and combine (A, B, C). Destructive interference: A crest and a trough meet and cancel each other (D, E, F). interference, in physics, ...

Montagnais and Naskapi

(Encyclopedia)Montagnais năsˈkəpē [key], aboriginal peoples originally from Labrador, Canada. Because they both spoke almost identical Algonquian languages and had similar customs, the two groups are often link...

mustard gas

(Encyclopedia)mustard gas, chemical compound used as a poison gas in World War I. The burning sensation it causes on contact with the skin is similar to that caused by oil from black mustard seeds. The compound is ...

giardiasis

(Encyclopedia)giardiasis jēärdīˈəsĭs, järdīˈəsĭs [key], infection of the small intestine by a protozoan, Giardia lamblia. Giardia, which was named after Alfred M. Giard, a French biologist, is spread via...

hydrofoil

(Encyclopedia)hydrofoil, flat or curved finlike device, attached by struts to the hull of a watercraft, that lifts the moving watercraft above the water's surface. The term is often extended to include the vessel i...

Comenius, John Amos

(Encyclopedia)Comenius, John Amos kōmēˈnēəs [key], Czech Jan Amos Komenský, 1592–1670, Moravian churchman and educator, last bishop of the Moravian Church. Comenius advocated relating education to everyday ...

Torgau

(Encyclopedia)Torgau tôrˈgou [key], city, Saxony, E central Germany, a port on the Elbe River. Manufactures include paper, iron products, glass, pottery, and agricultural machinery. Torgau is an important railway...

Yaroslav

(Encyclopedia)Yaroslav (Yaroslav the Wise) yərəslävˈ [key], 978–1054, grand duke of Kiev (1019–54); son of Vladimir I. Designated by his father to rule in Novgorod, he became grand duke of Kiev after defeat...