Columbia Encyclopedia

Search results

120 results found

Peacock, Thomas Love

(Encyclopedia)Peacock, Thomas Love, 1785–1866, English novelist and poet. He was employed by the East India Company from 1819 to 1856, serving as its chief examiner the final 20 years. Peacock's novels, comic and...

malnutrition

(Encyclopedia)malnutrition, insufficiency of one or more nutritional elements necessary for health and well-being. Primary malnutrition is caused by the lack of essential foodstuffs—usually vitamins, minerals, or...

tannin

(Encyclopedia)tannin, tannic acid, or gallotannic acid, astringent vegetable product found in a wide variety of plants. Sources include the bark of oak, hemlock, chestnut, and mangrove; the leaves of certain sumac...

L'Amour, Louis

(Encyclopedia)L'Amour, Louis, 1908–88, American writer of western fiction, b. Jamestown, N.Dak., as Louis Dearborn LaMoore. He began writing in the 1940s, contributing stories to magazines under the name Tex Burn...

Rio Branco, José Maria da Silva Paranhos, barão do

(Encyclopedia)Rio Branco, José Maria da Silva Paranhos, barão do zho͝ozĕˈ mərēˈə də sēlˈvə pəräˈnyo͝os bərouNˈ do͝o rēˈo͝o brängˈko͝o [key], 1845–1912, Brazilian statesman and diplomat. ...

titanium

(Encyclopedia)titanium tītāˈnēəm, tĭ– [key] [from Titan], metallic chemical element; symbol Ti; at. no. 22; at. wt. 47.867; m.p. 1,675℃; b.p. 3,260℃; sp. gr. 4.54 at 20℃; valence +2, +3, or +4. Titani...

hydrogen sulfide

(Encyclopedia)hydrogen sulfide, chemical compound, H2S, a colorless, extremely poisonous gas that has a very disagreeable odor, much like that of rotten eggs. It is slightly soluble in water and is soluble in carbo...

hydrotherapy

(Encyclopedia)hydrotherapy, use of water in the treatment of illness or injury. Although the medicinal and hygienic value of water was recognized by the early Greeks, hydrotherapy attained its widest use in the 18t...

tetraethyl lead

(Encyclopedia)tetraethyl lead tĕtˌrəĕthˈəl [key], (C2H5)4Pb, viscous, colorless, poisonous liquid. It is an organometallic compound prepared by reacting ethyl chloride with a sodium-lead alloy. When added to ...

Wolff, Christian von

(Encyclopedia)Wolff or Wolf, Christian von krĭsˈtyän fən vôlf [key], 1679–1754, German philosopher. One of the first to use the German language instead of Latin, he systematized and popularized the doctrines...