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conjunctivitis

(Encyclopedia)conjunctivitis kənjəngtəvīˈtəs [key], inflammation or infection of the mucosal membrane that covers the eyeball and lines the eyelid, usually acute, caused by a virus or, less often, by a bacill...

John of Salisbury

(Encyclopedia)John of Salisbury sôlzˈbərē [key], c.1110–1180, English scholastic philosopher, b. Salisbury. He studied in France at Paris and Chartres under Abelard and other famous teachers. He was secretary...

agate

(Encyclopedia)agate ăgˈĭt [key], translucent, cryptocrystalline variety of quartz and a subvariety of chalcedony. Agates are identical in chemical structure to jasper, flint, chert, petrified wood, and tiger's-e...

sodium bicarbonate

(Encyclopedia)sodium bicarbonate or sodium hydrogen carbonate, chemical compound, NaHCO3, a white crystalline or granular powder, commonly known as bicarbonate of soda or baking soda. It is soluble in water and ver...

silver chloride

(Encyclopedia)silver chloride, chemical compound, AgCl, a white cubic crystalline solid. It is nearly insoluble in water but is soluble in a water solution of ammonia, potassium cyanide, or sodium thiosulfate (“h...

cation

(Encyclopedia)cation kătˌīˈən [key], atom or group of atoms carrying a positive charge. The charge results because there are more protons than electrons in the cation. Cations can be formed from a metal by oxi...

soap

(Encyclopedia)soap, a cleansing agent. It cleanses by lowering the surface tension of water, by emulsifying grease, and by absorbing dirt into the foam. Ancient peoples are believed to have employed wood ashes and ...

contact lens

(Encyclopedia)contact lens, thin plastic lens worn between the eye and eyelid that may be used instead of eyeglasses. Actors, models, and others wear them for appearance, and athletes use them for safety and conven...

Fletcher, John

(Encyclopedia)Fletcher, John, 1579–1625, English dramatist, b. Rye, Sussex, educated at Cambridge. A member of a prominent literary family, he began writing for the stage about 1606, first with Francis Beaumont, ...

Makarios III

(Encyclopedia)Makarios III mäkäˈrēôs [key], 1913–77, Orthodox Eastern archbishop and Cypriot statesman, first president of Cyprus (1960–77). Born Michael Mouskos, Makarios was elected bishop of Kition in 1...