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Rio Branco, José Maria da Silva Paranhos, barão do

(Encyclopedia)Rio Branco, José Maria da Silva Paranhos, barão do zho͝ozĕˈ mərēˈə də sēlˈvə pəräˈnyo͝os bərouNˈ do͝o rēˈo͝o brängˈko͝o [key], 1845–1912, Brazilian statesman and diplomat. ...

titanium

(Encyclopedia)titanium tītāˈnēəm, tĭ– [key] [from Titan], metallic chemical element; symbol Ti; at. no. 22; at. wt. 47.867; m.p. 1,675℃; b.p. 3,260℃; sp. gr. 4.54 at 20℃; valence +2, +3, or +4. Titani...

Whittier, John Greenleaf

(Encyclopedia)Whittier, John Greenleaf hwĭtˈēər [key], 1807–92, American Quaker poet and reformer, b. near Haverhill, Mass. Whittier was a pioneer in regional literature as well as a crusader for many humanit...

tetraethyl lead

(Encyclopedia)tetraethyl lead tĕtˌrəĕthˈəl [key], (C2H5)4Pb, viscous, colorless, poisonous liquid. It is an organometallic compound prepared by reacting ethyl chloride with a sodium-lead alloy. When added to ...

hydrogen sulfide

(Encyclopedia)hydrogen sulfide, chemical compound, H2S, a colorless, extremely poisonous gas that has a very disagreeable odor, much like that of rotten eggs. It is slightly soluble in water and is soluble in carbo...

hydrotherapy

(Encyclopedia)hydrotherapy, use of water in the treatment of illness or injury. Although the medicinal and hygienic value of water was recognized by the early Greeks, hydrotherapy attained its widest use in the 18t...

Wolff, Christian von

(Encyclopedia)Wolff or Wolf, Christian von krĭsˈtyän fən vôlf [key], 1679–1754, German philosopher. One of the first to use the German language instead of Latin, he systematized and popularized the doctrines...

quinine

(Encyclopedia)quinine kwīˈnīnˌ, kwĭnēnˈ [key], white crystalline alkaloid with a bitter taste. Before the development of more effective synthetic drugs such as quinacrine, chloroquine, and primaquine, quinin...

Pocahontas

(Encyclopedia)Pocahontas pōkəhŏnˈtəs [key], c.1595–1617, Native North American woman, daughter of Chief Powhatan. Pocahontas, meaning “playful one” (her birth name was Amonute, and her family called her ...

Bruce, Edward

(Encyclopedia)Bruce, Edward, d. 1318, Scottish king of Ireland, brother of Robert I of Scotland. He aided his brother in the war for independence from England and in 1315 was declared heir to Robert's throne. With ...