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Catlett, Elizabeth

(Encyclopedia)Catlett, Elizabeth, 1915–2012, American-Mexican sculptor, painter, and printmaker, considered one of the foremost African-American artists of her era, b. Washington, D.C., grad. Howard Univ. (B.A., ...

Wythe, George

(Encyclopedia)Wythe, George wĭth [key], 1726–1806, American lawyer, signer of the Declaration of Independence, b. Elizabeth City co., Va. Admitted to the bar in 1746, Wythe was a member (1754–55, 1758–68) an...

Falmouth, town, England

(Encyclopedia)Falmouth fălˈməth [key], town, Cornwall, SW England, on a small peninsula between Falmouth ...

ammonium nitrate

(Encyclopedia)ammonium nitrate, chemical compound, NH4NO3, that exists as colorless, rhombohedral crystals at room temperature but changes to monoclinic crystals when heated above 32℃. It is extremely soluble in ...

ocher

(Encyclopedia)ocher ōˈkər [key], mixture of varying proportions of iron oxide and clay, used as a pigment. It occurs naturally as yellow ocher (yellow or yellow-brown in color), the iron oxide being limonite, or...

Linear Scripts

(Encyclopedia)Linear Scripts, forms of Minoan writing. The earliest Minoan writing consisted of pictographs, called Cretan hieroglyphs, which date from about 2000 b.c. The first linear script, Linear A, dates from ...

Iceland spar

(Encyclopedia)Iceland spar, colorless variety of crystallized calcite, characterized by its properties of transparency and double refraction. It is used chiefly in the manufacture of Nicol prisms, which are essenti...

tracer

(Encyclopedia)tracer, an identifiable substance used to follow the course of a physical, chemical, or biological process. In chemistry the ideal tracer has the same chemical properties as the molecule it replaces a...

silicate

(Encyclopedia)silicate, chemical compound containing silicon, oxygen, and one or more metals, e.g., aluminum, barium, beryllium, calcium, iron, magnesium, manganese, potassium, sodium, or zirconium. Silicates may b...

Pylos

(Encyclopedia)Pylos pīˈlŏs [key], ancient harbor, Messenia, SW Greece, on a bay of the Ionian Sea. Excavations have revealed a great Mycenaean palace of the 13th cent. b.c., perhaps the dwelling of King Nestor. ...