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potassium

(Encyclopedia)potassium pətăsˈēəm [key], a metallic chemical element; symbol K [Lat. kalium=alkali]; at. no. 19; at. wt. 39.0983; m.p. 63.25℃; b.p. 760℃; sp. gr. .862 at 20℃; valence +1. Potassium is a s...

sodium

(Encyclopedia)sodium, a metallic chemical element; symbol Na [Lat. natrium]; at. no. 11; at. wt. 22.98977; m.p. 97.81℃; b.p. 892.9℃; sp. gr. 0.971 at 20℃; valence +1. Sodium is a soft, silver-white metal. Ext...

boron

(Encyclopedia)boron bōrˈŏn [key] [New Gr. from borax], chemical element; symbol B; at. no. 5; interval in which at. wt. ranges 10.806–10.821; m.p. about 2,300℃; sublimation point about 2,550℃; sp. gr. 2.3 ...

strontium

(Encyclopedia)strontium strŏnˈshēəm [key] [from Strontian, a Scottish town], a metallic chemical element; symbol Sr; at. no. 38; at. wt. 87.62; m.p. 769℃; b.p. 1,384℃; sp. gr. 2.6 at 20℃; valence +2. Stro...

Smollett, Tobias George

(Encyclopedia)Smollett, Tobias George smŏlˈĭt [key], 1721–71, Scottish novelist. After studying at Glasgow he came to London in 1739. Failing to get his tragedy The Regicide produced, he shipped as a surgeon's...

Nolichucky

(Encyclopedia)Nolichucky nŏlˌĭchŭkˈē, nŏlˈĭchŭkˌē [key], river, c.150 mi (240 km) long, rising in the Blue Ridge, W N.C., and flowing NW and W to the French Broad River W of Greeneville, Tenn. A power d...

Launcelot, Sir

(Encyclopedia)Launcelot, Sir lănˈsəlŏtˌ, lŏnˈ–, lônˈ– [key], in Arthurian legend, bravest and most celebrated knight at the court of King Arthur. He was kidnapped as an infant by the mysterious Lady of...

Mordred, Sir

(Encyclopedia)Mordred, Sir: see Arthurian legend. ...

Modred, Sir

(Encyclopedia)Modred, Sir: see Arthurian legend. ...

Gawain, Sir

(Encyclopedia)Gawain, Sir gäˈwān, –wĭn [key], one of the most popular heroes of Arthurian legend; nephew of King Arthur. He was regarded, particularly in the early romances, as the model of chivalry—pure, b...