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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...

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...

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...

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...

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...

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...

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...