Columbia Encyclopedia

Search results

207 results found

Hamilton, Sir William Rowan

(Encyclopedia)Hamilton, Sir William Rowan, 1805–65, Irish mathematician and astronomer, b. Dublin. A child prodigy, he had mastered 13 languages by the age of 13 and was still an undergraduate when he became prof...

wool

(Encyclopedia)wool, fiber made from the fleece of the domestic sheep. In the United States, by the Wool Products Labeling Act of 1939, the term wool may be applied only to fabrics made entirely of new wool; t...

teff

(Encyclopedia)teff, annual plant, Eragrostis tef, of the grass family (Poaceoe), whose seeds are a staple grain in Ethiopia and Eritrea. It is a gluten-free cereal grain, high in iron, protein, calcium, vitamin C, ...

rare earths

(Encyclopedia)rare earths, in chemistry, oxides of the rare-earth metals. They were once thought to be elements themselves. They are widely distributed in the earth's crust and are fairly abundant, although they we...

pectin

(Encyclopedia)pectin, any of a group of white, amorphous, complex carbohydrates that occur in ripe fruits and certain vegetables. Fruits rich in pectin are the peach, apple, currant, and plum. Protopectin, present ...

Lisburn

(Encyclopedia)Lisburn lĭzˈbûrnˌ, lĭsˈ– [key], town (1991 pop. 40,391) and district, E Northern Ireland, on the Lagan River. The town's chief industry, linen manufacture, was introduced by the Huguenots afte...

vegetable

(Encyclopedia)vegetable, term originally used for any plant, now the name for many food plants, most of them annuals, and for their edible parts. There is no clear botanical distinction between vegetables and fruit...

thread

(Encyclopedia)thread, a fine twist of fibrous material, distinguished from yarn in general by being smoother, stronger, and more pliable; it is also better suited to sewing, embroidery, and lace making. Sewing or s...

racquetball

(Encyclopedia)racquetball, sport played indoors by two or four players, combining elements of court handball and such racket games as squash racquets. It is played on a standard handball court 40 ft (12.2 m) long, ...

laser

(Encyclopedia)CE5 Ordinary light sources produce incoherent light, while a laser produces a beam of coherent light. laser [acronym for light amplification by stimulated emission of radiation], device for the cr...