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tubercle

(Encyclopedia)tubercle to͞oˈbərkyo͞olˌ [key] [Lat.,=little swelling], small, usually solid, nodule or prominence. In anatomy the term is applied to natural prominences in certain muscles, to nerve nuclei of th...

carbide

(Encyclopedia)carbide, any one of a group of compounds that contain carbon and one other element that is either a metal, boron, or silicon. Generally, a carbide is prepared by heating a metal, metal oxide, or metal...

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...

Scheele, Karl Wilhelm

(Encyclopedia)Scheele, Karl Wilhelm kärl vĭlˈhĕlm shāˈlə [key], 1742–86, Swedish chemist, b. Stralsund. He is known as the discoverer of many chemical substances. He was a pharmacist in Stockholm, in Uppsa...

ionic bond

(Encyclopedia)ionic bond: see chemical bond.

electrovalent bond

(Encyclopedia)electrovalent bond: see chemical bond. ...

reaction rate

(Encyclopedia)reaction rate: see chemical reaction. ...

Wayland

(Encyclopedia)Wayland, town (1990 pop. 11,874), Middlesex co., E Mass., W of Boston; settled c.1638, inc. 1835. Electronic and chemical research is carried on there. ...

Kaolack

(Encyclopedia)Kaolack kouˈläk [key], city (1988 pop. 150,961), W Senegal, a port on the Saloum River. Lying in a farm area, Kaolack is a major peanut marketing and exporting center and has a large peanut oil fact...

Murray, cities, United States

(Encyclopedia)Murray. 1 City (1990 pop. 14,439), seat of Calloway co., SW Ky., near the Tenn. line; inc. 1844. There is light manufacturing. Tobacco and grain are grown, livestock and poultry are raised, and there ...