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light-emitting diode

(Encyclopedia)light-emitting diode: see diode.

electric-light bug

(Encyclopedia)electric-light bug: see water bug. ...

Lee, Light-Horse Harry

(Encyclopedia)Lee, Light-Horse Harry: see Lee, Henry. ...

International Union for the Conservation of Nature and Natural Resources

(Encyclopedia)International Union for the Conservation of Nature and Natural Resources (IUCN), formerly World Conservation Union, international organization founded in 1948 to encourage the preservation of wildlife...

Vincent of Beauvais

(Encyclopedia)Vincent of Beauvais bōvāˈ [key], c.1190–c.1264, French Dominican friar. He was the author of three of the four parts of the Speculum majus, of great value as a summary of the knowledge of his tim...

aberration of starlight

(Encyclopedia)aberration of starlight, displacement of the apparent path of light from a star, resulting in a displacement of the apparent position of the star from its true position; discovered by the English astr...

optics

(Encyclopedia)optics, scientific study of light. Physical optics is concerned with the genesis, nature, and properties of light; physiological optics with the part light plays in vision; and geometrical optics with...

Alexander of Aphrodisias

(Encyclopedia)Alexander of Aphrodisias ăfrōdĭshˈēəs [key], fl. a.d. 200, Greek Peripatetic philosopher. A celebrated ancient commentator on Aristotle, he was often called the Exegete. Among his extant writing...

Stokes, Sir George Gabriel

(Encyclopedia)Stokes, Sir George Gabriel, 1819–1903, British mathematician and physicist, b. Ireland, studied at Cambridge. From 1849 he was a professor of mathematics at Cambridge; he served as secretary (1854�...

William of Champeaux

(Encyclopedia)William of Champeaux shămpōˈ, shäNpōˈ [key], c.1070–1121, French scholastic philosopher. William studied and taught in Paris. In 1109 he founded the monastic school of St. Victor, which later ...