Related Searches
on Ask.com
palladium
11 dictionary results for: Palladium
Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This
pal·la·di·um 
[puh-ley-dee-uhm] Pronunciation Key
[puh-ley-dee-uhm] Pronunciation Key –noun Chemistry.
| a rare metallic element of the platinum group, silver-white, ductile and malleable, harder and fusing more readily than platinum: used chiefly as a catalyst and in dental and other alloys. Symbol: Pd; atomic weight: 106.4; atomic number: 46; specific gravity: 12 at 20°C. |
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This
Pal·la·di·um
[puh-ley-dee-uhm] Pronunciation Key
[puh-ley-dee-uhm] Pronunciation Key –noun, plural -di·a
[-dee-uh] Pronunciation Key.
[-dee-uh] Pronunciation Key. | 1. | Also, Pal·la·di·on
[puh-ley-dee-on] Pronunciation Key. a statue of Athena, esp. one on the citadel of Troy on which the safety of the city was supposed to depend. |
| 2. | (usually lowercase) anything believed to provide protection or safety; safeguard. |
[Origin: < L Palladium < Gk Palládion, n. use of neut. of Palládios of Pallas, equiv. to Pallad- (s. of Pallás) Pallas + -ios adj. suffix]
]
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
American Heritage Dictionary - Cite This Source - Share This
| pal·la·di·um 1
(pə-lā'dē-əm) Pronunciation Key
n. Symbol Pd A soft, ductile, steel-white, tarnish-resistant, metallic element occurring naturally with platinum, especially in gold, nickel, and copper ores. Because it can absorb large amounts of hydrogen, it is used as a purification filter for hydrogen and a catalyst in hydrogenation. It is alloyed for use in electric contacts, jewelry, nonmagnetic watch parts, and surgical instruments. Atomic number 46; atomic weight 106.4; melting point 1,552°C; boiling point 3,140°C; specific gravity 12.02 (20°C); valence 2, 3, 4. See Table at element. [From Pallas (discovered at the same time as the element).] |
(Download Now or Buy the Book)
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
American Heritage Dictionary - Cite This Source - Share This
| pal·la·di·um 2
(pə-lā'dē-əm) Pronunciation Key
n. pl. pal·la·di·a (-dē-ə) or pal·la·di·ums
[Middle English Palladion, a statue of Pallas Athena believed to protect Troy, from Old French palladion, from Latin Palladium, from Greek Palladion, from Pallas, Pallad-, Pallas Athena.] |
(Download Now or Buy the Book)
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Online Etymology Dictionary - Cite This Source - Share This
palladium
palladium
1600, "safeguard," originally (c.1374) "sacred image of Pallas Athene," from L. palladium, from Gk. Palladion, neut. of Palladios "of Pallas." It stood in the citadel of Troy and the safety of the city was believed to depend on it. As the name of a metallic element, it was coined 1803 by discoverer, William Hyde Wollaston (1766-1828), from Pallas, name of an asteroid discovered the previous year (by Ger. astronomer Olbers) and named for the goddess. The goddess' name is lit. "little maiden," related to pallake "concubine," probably somehow connected to Avestan pairika "beautiful women seducing pious men."
Online Etymology Dictionary, © 2001 Douglas Harper
WordNet - Cite This Source - Share This
| palladium | |
noun | |
| a silver-white metallic element of the platinum group that resembles platinum; occurs in some copper and nickel ores; does not tarnish at ordinary temperatures and is used (alloyed with gold) in jewelry |
WordNet® 3.0, © 2006 by Princeton University.
The American Heritage Science Dictionary - Cite This Source - Share This
| palladium
(pə-lā'dē-əm) Pronunciation Key
Symbol Pd
A malleable, ductile, grayish-white metallic element that occurs naturally with platinum. It is used as a catalyst in hydrogenation and in alloys for making electrical contacts and jewelry. Atomic number 46; atomic weight 106.4; melting point 1,552°C; boiling point 3,140°C; specific gravity 12.02 (20°C); valence 2, 3, 4. See Periodic Table.
|
The American Heritage® Science Dictionary
Copyright © 2002 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Copyright © 2002 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
American Heritage Stedman's Medical Dictionary - Cite This Source - Share This
palladium pal·la·di·um (pə-lā'dē-əm)
n.
Symbol Pd
A soft ductile metallic element occurring naturally with platinum, especially in gold, nickel, and copper ores, and used as a catalyst in hydrogenation. Atomic number 46; atomic weight 106.4; melting point 1,555°C; boiling point 2,963°C; specific gravity 12.02 (20°C); valence 2, 3, 4.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Investopedia - Cite This Source - Share This
Palladium
An element commonly used in jewelry, electronics, and the purification of hydrogen.
Investopedia Commentary
Palladium is considered to be a precious metal.
See also: Bullion, Iridium, Platinum, Precious Metal, Silver
Investopedia.com. Copyright © 1999-2005 - All rights reserved. Owned and Operated by Investopedia Inc.
Webster's Revised Unabridged Dictionary - Cite This Source - Share This
Palladium
Pal*la"di*um\, n. [L., fr. Gr. ?, fr. ?, ?, Pallas.]1. (Gr. Antiq.) Any statue of the goddess Pallas; esp., the famous statue on the preservation of which depended the safety of ancient Troy. 2. Hence: That which affords effectual protection or security; a sateguard; as, the trial by jury is the palladium of our civil rights. --Blackstone.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
Webster's Revised Unabridged Dictionary - Cite This Source - Share This
Palladium
Pal*la"di*um\, n. [NL.] (Chem.) A rare metallic element of the light platinum group, found native, and also alloyed with platinum and gold. It is a silver-white metal resembling platinum, and like it permanent and untarnished in the air, but is more easily fusible. It is unique in its power of occluding hydrogen, which it does to the extent of nearly a thousand volumes, forming the alloy Pd2H. It is used for graduated circles and verniers, for plating certain silver goods, and somewhat in dentistry. It was so named in 1804 by Wollaston from the asteroid Pallas, which was discovered in 1802. Symbol Pd. Atomic weight, 106.2.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
Share This:
Copyright © 2008, Dictionary.com, LLC. All rights reserved.