• WordNet 3.6
    • n palladium 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
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Webster's Revised Unabridged Dictionary
    • n Palladium (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, with a melting point of 1555° C. It can also be prepared as a finely divided black powder. It is unique in its power of absorbing 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 number, 46. Atomic weight, 106.42. Density 12.0.
    • Palladium (Gr. Antiq) Any statue of the goddess Pallas; esp., the famous statue on the preservation of which depended the safety of ancient Troy.
    • Palladium That which affords effectual protection or security; a safeguard; as, the trial by jury is the palladium of our civil rights.
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Century Dictionary and Cyclopedia
    • n palladium A statue or image of the goddess Pallas; especially, in art and legend, a xoanon image. On the preservation of such an image, according to the legend, depended the safety of Troy.
    • n palladium Anything believed or reputed to afford effectual defense, protection, and safety: as, trial by jury is the palladium of our civil rights.
    • n palladium Chemical symbol, Pd; atomic weight, 106.5. One of the rare metals associated with platinum. It was separated from native platinum by Wollaston in 1803, and named after the planet Pallas, which had just before that time been discovered by Olbers. Palladium is dimorphous. It occurs in Brazil native, in minute octahedral crystals; and on the Harz it has been found in small hexagonal plates. It is, however, a decidedly rare substance, and the chief supply comes from the working over of the platiniferous residues of various mints. It resembles platinum in appearance, but is harder; its specific gravity is 11.4. It fuses more readily than platinum or any other of the so-called platinum metals, melting, as is stated by some authorities, about as easily as wrought-iron. It is both ductile and malleable, and would be a very useful metal if it were not so scarce as to be expensive and irregularly attainable. The graduated surfaces of some astronomical instruments have been made of palladium, a use for which this metal is admirably adapted on account of its color and its unalterability in the air. Alloyed with silver, it has been employed by dentists as a substitute for gold.
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Chambers's Twentieth Century Dictionary
    • n Palladium pal-lā′di-um a statue of Pallas, on the preservation of which the safety of ancient Troy depended: any safeguard: a rare metal in colour and ductility resembling platinum
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  • Junius
    “The liberty of the Press is the Palladium of all the civil, political and religious rights of an Englishman.”


Webster's Revised Unabridged Dictionary
L., fr. Gr. Palla`dion, fr. Palla`s Palla`dos, Pallas
Chambers's Twentieth Century Dictionary
L.,—Gr. palladionPallas, Pallados, Pallas.


In literature:

An ancient oracle declared that, so long as the Palladium remained within the walls, Troy could not be taken.
"The Mysteries of All Nations" by James Grant
It is considered to be a palladium.
"Character Sketches of Romance, Fiction and the Drama" by E. Cobham Brewer
You have restored in their favour the Act of Navigation, that palladium of British commerce.
"The Loyalists of America and Their Times, Vol. 1 of 2" by Egerton Ryerson
Palladium (pal-la'-de-um), 299, 301.
"Myths and Legends of Ancient Greece and Rome" by E.M. Berens
But it is an humbling reflection, that the palladium of liberty could not be kept inviolate, even in the fastnesses of the Alps.
"Fox's Book of Martyrs" by John Foxe
Should she do so, it would be like the Palladium ceasing to stand and Troy falling.
"Elsie Marley, Honey" by Joslyn Gray
An English judge and an English jury were to him the Palladium of discerning truth.
"Orley Farm" by Anthony Trollope
We've just about time to get a look in at the Palladium.
"Punch, or the London Charivari, Vol. 158, May 5, 1920" by Various
The home ceases to be regarded as the sacred and eternal Palladium of society.
"Socialism: Positive and Negative" by Robert Rives La Monte
It is the great palladium of our liberty.
"The Continental Monthly, Vol. 6, No. 6, December 1864" by Various

In poetry:

In twilight still the shore remained;
But, toiling upward through the night,
A wistful mother had just gained
The summit of the sacred height,
Where Juno's far-famed statue stood,--
Palladium of motherhood.
"The Gift Of Juno" by John Lawson Stoddard

In news:

Everything was made with the precious metal palladium .
Wilco @ Hollywood Palladium : January 24, 2012.
When, at the 2007 CEDIA Expo, I encountered Klipsch's startlingly new Palladium P-39F loudspeaker ($20,000/pair), I was impressed by its looks.
Johnny Depp Wins Key Rulings in Hollywood Palladium Altercation Lawsuit.
The Center For The Performing Arts in Carmel, IN is scheduled to open on January 29, 2011, featuring four state-of-the-art performing arts venues: The Palladium , a 1,600-seat concert hall.
Platinum, Palladium Shortage Most in a Decade on Supply.
Nova CEO Wins Palladium Medal.
Palladium stages young 'Wild Party'.
The price of palladium is jumping amid concern that supply of the metal won't match projected demand this year.
On that day, Korn celebrated the album with a special record release show at the Hollywood Palladium featuring Skrillex, Kill the Noise, Datsik and other 'Path of Totality' contributors.
The Palladium Nightclub in Modesto, Calif, is suing a promoter because the club owner paid over $15,250 to have Kim Kardashian make several nightclub appearances, is exclusively reporting.
Palladium jumps amid supply shortfall concerns.
Taco Bueno's Parent Company Sold to Palladium Equity Partners.
Palladium ETF Soars on Speculation of Dwindling Supplies.
Swept Away At The Ala Wai Palladium (and possibly also at a cafetorium near you).

In science:

These metals include the transition elements palladium (Pd) and thorium (Th) that have unoccupied 4d- and 5f -electron shells, respectively.
Route to Room-Temperature Superconductivity from a Practical Point of View
Interestingly, the palladium-deuterium compound also superconducts, and its critical temperature equal to 11 K is higher than that of PdH.
Route to Room-Temperature Superconductivity from a Practical Point of View
The reflection and transmission spectra are constructed to simulate the substrate/MgxTi(1−x)H2/palladium setup as was used in the experiments by Borsa et al.6,9 All internal reflections and absorptions in the three layer system are taken into account.
First-principles study of the optical properties of MgxTi(1-x)H2
The nickel-palladium alloys (denoted here as NiPd), which form a solid solution over the whole concentration range, have been the sub ject of many studies for their magnetic properties.1–4 Indeed, palladium is the 4d parent of nickel.
On the magnetization textures in NiPd nanostructures
For the 4d series it is at the lower edge of the d-band for strontium, just below the top of the d-band for palladium, and about 3 eV above the upper edge of the d-band for silver.
Theory of Adsorption on Metal Substrates