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Bartolommeo di Pagholo del Fattorino, Fra

(Encyclopedia)Bartolommeo di Pagholo del Fattorino, Fra frä bärtōlōmĕˈō dē päˈgōlō dĕl fätˌtōrēˈnō [key], 1475–1517, Italian painter, also called Baccio della Porta. Under the influence of Savo...

periscope

(Encyclopedia)periscope pĕrˈĭskōp [key] [Gr.,=view around], instrument to enable a person to see objects not in his direct line of vision or concealed by some intervening body. Its essential parts are a tube, p...

cataract

(Encyclopedia)cataract, in medicine, opacity of the lens of the eye, which impairs vision. In the young, cataracts are generally congenital or hereditary; later they are usually the result of degenerative changes b...

Cædmon

(Encyclopedia)Cædmon kădˈmən [key], fl. 670, English poet. He was reputed by Bede to be the author of early English versions of various Old Testament stories. According to Bede, Cædmon was an ignorant herder w...

Morris, Wright

(Encyclopedia)Morris, Wright (Wright Marion Morris), 1910–98, American writer, b. Central City, Nebr. He was for many years professor of English at San Francisco State College (now San Francisco State Univ.). Fro...

guide dog

(Encyclopedia)guide dog, a dog trained to lead a blind person. The first school for training such dogs was established by the German government after World War I for the benefit of blinded veterans. Schools now exi...

Edgerton, Harold

(Encyclopedia)Edgerton, Harold, 1903–90, American inventor and educator, b. Fremont, Nebr. He was educated at the Univ. of Nebraska and the Massachusetts Institute of Technology (D.Sc., 1931), and taught at the l...

Crosby, Sidney Patrick

(Encyclopedia)Crosby, Sidney Patrick, 1987–, Canadian ice hockey player, b. Cole Harbour, N.S. The first draft pick in 2005, Crosby, scored 120 points in his second season with the Pittsburgh Penguins as a center...

color blindness

(Encyclopedia)color blindness, visual defect resulting in the inability to distinguish colors. About 8% of men and 0.5% of women experience some difficulty in color perception. Color blindness is usually an inherit...

eye bank

(Encyclopedia)eye bank, site for the collection, processing, and assignment of donated eyes. A donor's eyes are removed as soon as possible after death, sealed in a sterile container, and sent to the eye bank. Ther...