Columbia Encyclopedia

(Encyclopedia) chloroplast klōrˈəplăstˌ, klôrˈ– [key], a complex, discrete green structure, or organelle, contained in the cytoplasm of plant cells. Chloroplasts are reponsible for the green color of almost...

(Encyclopedia) engineering, profession devoted to designing, constructing, and operating the structures, machines, and other devices of industry and everyday life. Until the Industrial Revolution there were only t...

(Encyclopedia) Willard, Emma, 1787–1870, American educator, pioneer in woman's education, b. Emma Hart in Berlin, Conn. She attended and later taught in the local academy and in 1807 took charge of the Female Acad...

(Encyclopedia) International Union for the Conservation of Nature and Natural Resources (IUCN), formerly World Conservation Union, international organization founded in 1948 to encourage the preservation of wildlife...

(Encyclopedia) American Medical Association (AMA), professional physicians' organization (founded 1847). Its goals are to protect the interests of American physicians, advance public health, and support the growth o...

(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 ...

(Encyclopedia)  CE5 Ontario ŏntârˈēō [key], province (2001 pop. 11,410,046), 412,582 sq mi (1,068,587 sq km), E central Canada. Before the arrival of Europeans the Ontario region was inhabited by several Al...

(Encyclopedia)  Clyburn, Jim (James Enos Clyburn), 1940- , African-American politician, b. Sumter, S.C., S.C. State College (B.A.). Clyburn’s father was a fundament...

(Encyclopedia) Judd, Charles Hubbard, 1873–1946, American psychologist, b. India. He was educated at the Univ. of Leipzig (Ph.D., 1896), where he studied with Wilhelm Wundt. Judd taught at the Univ. of Cincinnati,...

(Encyclopedia) parochial school pərōˈkēəl [key], school supported by a religious body. In the United States such schools are maintained by a number of religious groups, including Lutherans, Seventh-day Adventis...