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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...

Deluge

(Encyclopedia)Deluge dĕlˈyo͞oj [key], in the Bible, the overwhelming flood that covered the earth and destroyed every living thing except the family of Noah and the creatures in his ark. Archaeology has yielded ...

darmstadtium

(Encyclopedia)darmstadtium, artificially produced radioactive chemical element; symbol Ds; at. no. 110; mass number of most stable isotope 281; m.p., b.p., sp. gr., and valence unknown. Situated in Group 10 of the ...

clearing

(Encyclopedia)clearing, in banking, the periodic settling of bankers' claims against each other, for which local banks establish clearinghouse associations. Clearinghouses are said to have existed in Florence by a....

europium

(Encyclopedia)europium yo͝orōˈpēəm [key] [from Europe], metallic chemical element; symbol Eu; at. no. 63; at. wt. 151.964; m.p. about 820℃; b.p. about 1,600℃; sp. gr. 5.25 at 25℃; valence +2 or +3. Europ...

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...

thulium

(Encyclopedia)thulium tho͞oˈlēəm [key] [from Thule, an ancient name for Scandinavia], metallic chemical element; symbol Tm; at. no. 69; at. wt. 168.93421; m.p. about 1,545℃; b.p. 1,947℃; sp. gr. 9.3; valenc...

Quemoy

(Encyclopedia)Quemoy kĭmoiˈ [key], Chin. Chinmen, Kinmen, or Jinmen, Taiwanese island group (2010 pop. 56,703), Taiwan Strait, just off Fujian prov., China, and c.150 mi (240 km) W of Taiwan. The group consists o...

Quiché

(Encyclopedia)Quiché kēchāˈ [key], indigenous peoples of Mayan linguistic stock, in the western highlands of Guatemala; most important group of the ancient southern Maya. The largest of the contemporary native ...

rhodium

(Encyclopedia)rhodium rōˈdēəm [key], metallic chemical element; symbol Rh; at. no. 45; at. wt. 102.90550; m.p. about 1,966℃; b.p. 3,727±100℃; sp. gr. 12.41 at 20℃; valence +2, +3, +4, +5, or +6. Rhodium ...