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dysprosium

(Encyclopedia)dysprosium dĭsprōˈzēəm [key] [Gr.,=hard to get at], metallic chemical element; symbol Dy; at. no. 66; at. wt. 162.500; m.p. 1,412℃; b.p. 2,562℃; sp. gr. 8.54 at 25℃; valence+3. Dysprosium i...

einsteinium

(Encyclopedia)einsteinium īnˈstīˌnēəm, īnstīˈ– [key] [for Albert Einstein], artificially produced radioactive chemical element; symbol Es; at. no. 99; mass no. of most stable isotope 252; m.p. about 860�...

pi

(Encyclopedia)pi, in mathematics, the ratio of the circumference of a circle to its diameter. The symbol for pi is π. The ratio is the same for all circles and is approximately 3.1416. It is of great importance in...

ytterbium

(Encyclopedia)ytterbium ĭtûrˈbēəm [key] [for Ytterby, a town in Sweden], metallic chemical element; symbol Yb; at. no. 70; at. wt. 173.054; m.p. 819℃; b.p. about 1,194℃; sp. gr. about 7.0; valence +2 or +3...

negligence

(Encyclopedia)negligence, in law, especially tort law, the breach of an obligation (duty) to act with care, or the failure to act as a reasonable and prudent person would under similar circumstances. For a plaintif...

Nussbaum, Martha Craven

(Encyclopedia)Nussbaum, Martha C., 1947–, American philosopher, b. New York City, Ph.D. Harvard University, 1975. The Ernst Freund Distinguished Service Professor o...

USA PATRIOT Act

(Encyclopedia)USA PATRIOT Act [Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorists], 2001, U.S. federal law intended to give federal authorities increased ...

Mattarella, Sergio

(Encyclopedia)Mattarella, Sergio, 1941–, Italian political leader. Born into a prominent Sicilian family, he studied law at the Sapienza Univ. of Rome and taught constitutional law at the Univ. of Palermo. He was...

Theodore I , Byzantine emperor of Nicaea

(Encyclopedia)Theodore I (Theodore Lascaris), d. 1222, Byzantine emperor of Nicaea (1204–22), son-in-law of the Byzantine emperor Alexius III. He escaped from Constantinople after it was captured (1204) by the La...

entrapment

(Encyclopedia)entrapment, in law, the instigation of a crime in the attempt to obtain cause for a criminal prosecution. Situations in which a government operative merely provides the occasion for the commission of ...