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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...

slate

(Encyclopedia)slate, fine-grained rock formed when sedimentary rocks such as shale are metamorphosed by great pressure. Slate splits into perfectly cleaved, broad thin layers; this characteristically regular and pl...

sailfish

(Encyclopedia)sailfish, common name for a marine game and food fish, genus Istiophorus, belonging to the family Istiophoridae and related to the marlin. It is named for its high, wide dorsal fin (or “sail”), co...

Spotswood, Alexander

(Encyclopedia)Spotswood, Alexander, 1676–1740, colonial governor of Virginia, b. Tangier, Morocco. Appointed in 1710, he was officially lieutenant governor under the nominal governorship of George Hamilton, 1st e...

cyanobacteria

(Encyclopedia)cyanobacteria sīˌənōbăktĭrˈēə, sī-ănˌō– [key] or blue-green algae, photosynthetic bacteria that contain chlorophyll. For many years they were classified in the plant kingdom along with ...

Delany, Samuel R.

(Encyclopedia)Delany, Samuel R. (Samuel Ray Delany, Jr.), 1942–, African-American wrtier, b. Harlem, New York City. Delany uses science fiction, fantasy, and memoir to explore sexual identity, race, language, and...

Oliver, Mary

(Encyclopedia)Oliver, Mary, 1935–2019, American poet, b. Cleveland, Ohio, studied Ohio State Univ., Vassar. She published her first collection of poems, No Voyage and Other Poems, in 1963. She was a keen observer...

opal

(Encyclopedia)opal ōˈpəl [key], a mineral consisting of poorly crystalline to amorphous silica, SiO2·nH2O; the water content is quite variable but usually ranges from 3% to 10%. Common opal is usually colorless...

porgy

(Encyclopedia)porgy pôrˈgē [key], common name for members of the Sparidae, a family of small-mouthed fishes with strong teeth adapted for crushing their food of shellfish and crustaceans. Porgies are found in wa...

Portland vase

(Encyclopedia)Portland vase, a Roman glass vase, known also as the Barberini vase. It is an unusually fine work of the late Augustan era (early 1st cent. b.c.). About 10 in. (25 cm) high and 22 in. (56 cm) in circu...