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palladia

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Pal⋅la⋅di⋅um

  [puh-ley-dee-uhm]
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–noun, plural -di⋅a  [-dee-uh] .
1. Also, Pal⋅la⋅di⋅on  [puh-ley-dee-on] . 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
Based on the Random House Dictionary, © Random House, Inc. 2009.
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pal·la·di·a   (pə-lā'dē-ə)   
n.  A plural of palladium2.
pal·la·di·um 1   (pə-lā'dē-əm)   
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).]
pal·la·di·um 2   (pə-lā'dē-əm)   
n.   pl. pal·la·di·a (-dē-ə) or pal·la·di·ums

  1. A safeguard, especially one viewed as a guarantee of the integrity of social institutions: the Bill of Rights, palladium of American civil liberties.

  2. A sacred object that was believed to have the power to preserve a city or state possessing it.


[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.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

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
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Medical Dictionary

Main Entry: pal·la·di·um
Pronunciation: p&-'lAd-E-&m
Function: noun
: a silver-white ductile malleable metallic element of theplatinum group that is used especially in electrical contacts, as a catalyst, and in alloys —symbol Pd; —see ELEMENT table
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

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.
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Science Dictionary
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. Published by Houghton Mifflin. All rights reserved.
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