Columbia Encyclopedia

Search results

500 results found

geode

(Encyclopedia)geode jēˈōd [key], hollow, globular rock nodule ranging in diameter from 1 to 12 in. (2.54–30.5 cm) or more. Most geodes are partly filled with mineral matter; they have a thin layer of chalcedon...

fuse, electric

(Encyclopedia)fuse, electric, safety device used to protect an electric circuit against an excessive current. A fuse consists essentially of a strip of low-melting alloy enclosed in a suitable housing. It is connec...

Gary, Elbert Henry

(Encyclopedia)Gary, Elbert Henry, 1846–1927, American lawyer and industrialist, b. near Wheaton, Ill., grad. Union College of Law, Chicago, 1868. Rising rapidly as a corporation lawyer, he became mayor of Wheaton...

acetylene

(Encyclopedia)acetylene ĕthˈīn [key], HC≡CH, a colorless gas. It melts at −80.8℃ and boils at −84.0℃. Offensive odors often noted in commercial acetylene are due to impurities. Acetylene forms explosiv...

lock, canal

(Encyclopedia)lock, canal, stretch of water enclosed by gates, one at each end, built into a canal or river for the purpose of raising or lowering a vessel from one water level to another. A lock may also be built ...

neostigmine

(Encyclopedia)neostigmine nēˌōstĭgˈmēn, –mĭn [key], drug used to mimic the effects of stimulation of the parasympathetic nervous system. Along with several other drugs that have a similar mode of action, i...

air mass

(Encyclopedia)air mass, large body of air within the earth's atmosphere in which temperature and humidity, although varying at different heights, remain similar throughout the body at any one height. Air masses for...

cacao

(Encyclopedia)cacao kəkäˈō, –kāˈ– [key], tropical tree (Theobroma cacao) of the family Sterculiaceae (sterculia family), native to South America, where it was first domesticated and was highly prized by t...

Szymborska, Wisława

(Encyclopedia)Szymborska, Wisława wēswäˈvä shĭmbôrˈskä [key], 1923–2012, Polish poet, b. Bnin, studied Jagiellonian Univ., Kraków (1945–48). Although highly acclaimed in her homeland, Szymborska was l...

van der Waals, Johannes Diderik

(Encyclopedia)van der Waals, Johannes Diderik yōhäˈnəs dēˈdərĭk vän dər väls [key], 1837–1923, Dutch physicist. It had been known for some time that the behavior of real gases differs from that of an i...