Columbia Encyclopedia

Search results

144 results found

carbon tetrachloride

(Encyclopedia)carbon tetrachloride tĕˌtrəklôrˌəmĕthˈān [key], CCl4, colorless, poisonous, liquid organic compound that boils at 76.8℃. It is toxic when absorbed through the skin or when inhaled. It react...

geranium

(Encyclopedia)geranium, common name for some members of the Geraniaceae, a family of herbs and small shrubs of temperate and subtropical regions. Their long, beak-shaped fruits give them the popular names crane's-b...

palmitin

(Encyclopedia)palmitin pălˈmətĭn [key], fat that is the triglyceride of palmitic acid, CH3(CH2)14CO2H, i.e., the tripalmitate ester of glycerol. It is a white crystalline solid at ordinary temperatures, insolub...

rue

(Encyclopedia)rue, common name for various members of the family Rutaceae, a large group of plants distributed throughout temperate and tropical regions and most abundant in S Africa and Australia. Most species are...

hydrogenation

(Encyclopedia)hydrogenation hīdrôjˈənāˌshən, hīˌdrəjənāˈshən [key], chemical reaction of a substance with molecular hydrogen, usually in the presence of a catalyst. A common hydrogenation is the harde...

Gris, Juan

(Encyclopedia)Gris, Juan hwän grēs [key], 1887–1927, Spanish cubist painter, whose original name was José Victoriano González. After studying in Madrid he settled in Paris in 1906, where he held his first exh...

lubrication

(Encyclopedia)lubrication, introduction of a substance between the contact surfaces of moving parts to reduce friction and to dissipate heat. A lubricant may be oil, grease, graphite, or any substance—gas, liquid...

Chardin, Jean-Baptiste-Siméon

(Encyclopedia)Chardin, Jean-Baptiste-Siméon zhäN-bätēstˈ-sēmāôNˈ shärdăNˈ [key], 1699–1779, French painter. He was a major figure of 18th-century painting. While the Académie royale still advocated h...

Guercino

(Encyclopedia)Guercino gwĕrchēˈnō [key], 1591–1666, Italian painter whose original name was Giovanni Francesco Barbieri, b. near Bologna. He studied with Ludovico Carracci. Extremely skillful, prolific, and q...

Velasco, José María

(Encyclopedia)Velasco, José María hōsāˈ märēˈä vāläsˈkō [key], 1840–1912, Mexican landscape painter; teacher of Diego Rivera. A gifted artisan descended from a family of shawl weavers, he entered the...