Columbia Encyclopedia

Search results

497 results found

e-cigarette

(Encyclopedia)e-cigarette or electronic cigarette, a device that produces an aerosol from a liquid containing nicotine or another active ingredient, allowing it to be inhaled in a manner similar to smoking a cigare...

bedbug

(Encyclopedia)bedbug, any of the small, blood-sucking bugs of the family Cimicidae, which includes about 30 species distributed throughout the world. Bedbugs are flat-bodied, oval, reddish brown, and about 1⁄4 in...

vibration

(Encyclopedia)vibration, in physics, commonly an oscillatory motion—a movement first in one direction and then back again in the opposite direction. It is exhibited, for example, by a swinging pendulum, by the pr...

tar and pitch

(Encyclopedia)tar and pitch, viscous, dark-brown to black substances obtained by the destructive distillation of coal, wood, petroleum, peat, and certain other organic materials. The heating or partial burning of w...

chiropractic

(Encyclopedia)chiropractic kīrəprăkˈtĭk [key] [Gr.,=doing by hand], medical practice based on the theory that all disease results from a disruption of the functions of the nerves. The principal source of inter...

denaturation

(Encyclopedia)denaturation, term used to describe the loss of native, higher-order structure of protein molecules in solution. Most globular proteins exhibit complicated three-dimensional folding described as secon...

Higginson, Thomas Wentworth

(Encyclopedia)Higginson, Thomas Wentworth, 1823–1911, American author, b. Cambridge, Mass. A Unitarian minister, he was a leader in the abolitionist movement and was a member of a group that backed John Brown's a...

hydrazine

(Encyclopedia)hydrazine hīˈdrəzēnˌ [key], chemical compound, formula NH2NH2, m.p. 1.4℃, b.p. 113.5℃, specific gravity 1.011 at 15℃. It is very soluble in water and soluble in alcohol. At ordinary tempera...

Kipling, Rudyard

(Encyclopedia)Kipling, Rudyard, 1865–1936, English author, b. Bombay (now Mumbai), India. Educated in England, Kipling returned to India in 1882 and worked as an editor on a Lahore paper. His early poems were col...

silica

(Encyclopedia)silica or silicon dioxide, chemical compound, SiO2. It is insoluble in water, slightly soluble in alkalies, and soluble in dilute hydrofluoric acid. Pure silica is colorless to white. It occurs in sev...