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methyl

(Encyclopedia)methyl mĕthˈəl [key], CH3, organic free radical or alkyl group derived from methane by the removal of one hydrogen atom. ...

tartar

(Encyclopedia)tartar or argol ärˈgəl [key], impure potassium hydrogen tartrate deposited as a crust in fermenting vessels during wine making. When purified, it yields cream of tartar. Tartar is the chief natural...

Ångström, Anders Jöns

(Encyclopedia)Ångström, Anders Jöns änˈdərs yöns ōngˈström [key], 1814–74, Swedish physicist. He was educated at the Univ. of Uppsala and in 1839 became a member of its faculty. He is particularly noted...

phenyl

(Encyclopedia)phenyl fĕnˈəl [key], C6H5, organic free radical or alkyl group derived from benzene by removing one hydrogen atom. ...

mercurous chloride

(Encyclopedia)mercurous chloride, mercury (I) chloride, or calomel, chemical compound, Hg2Cl2, a white crystalline powder, very slightly soluble in water. It was once used medicinally as a purgative, cathartic, li...

Sturza, Dimitrie A.

(Encyclopedia)Sturza or Sturdza, Dimitrie A. both: dēmēˈtrēyĕ sto͝orˈdzə [key], 1833–1914, Romanian statesman, of a prominent Moldavian family. With Ion Bratianu and Constantin Rosetti he helped bring abo...

Lipscomb, William Nunn, Jr.

(Encyclopedia)Lipscomb, William Nunn, Jr. lĭpˈskəm [key], 1919–2011, American physical chemist, b. Cleveland, Ph.D. California Institute of Technology, 1946. A professor of chemistry at the Univ. of Minnesota ...

ethyl

(Encyclopedia)ethyl ĕthˈəl [key], CH3CH2, organic free radical or alkyl group derived from ethane by removing one hydrogen atom. ...

radiation sickness

(Encyclopedia)radiation sickness, harmful effect produced on body tissues by exposure to radioactive substances. The biological action of radiation is not fully understood, but it is believed that a disturbance in ...

brown dwarf

(Encyclopedia)brown dwarf, in astronomy, celestial body that is larger than a planet but does not have sufficient mass to convert hydrogen into helium via nuclear fusion as stars do. Also called “failed stars,”...