Definitions for Palladiumpəˈleɪ di əm; -di ə

This page provides all possible meanings and translations of the word Palladium

Random House Webster's College Dictionary

pal•la•di•umpəˈleɪ di əm(n.)

  1. a rare silver-white ductile metallic element of the platinum group, used chiefly as a catalyst and in dental and other alloys.

    Category: Chemistry

    Ref: Symbol: Pd; 1

Origin of palladium:

1803; after the asteroid Pallas, then newly discovered; see Palladium , -ium2

pal•lad′ic-ˈlæd ɪk; pəˈleɪ dəs, ˈpæl ə dəs(adj.)

Pal•la•di•umpəˈleɪ di əm; -di ə(n.)(pl.)-di•a

  1. a statue of Athena, esp. one on the citadel of Troy on which the safety of the city was supposed to depend.

    Category: Antiquities

  2. (usu. l.c.) anything believed to provide protection or safety; safeguard.

Origin of Palladium:

< L Palladium < Gk Palládion, n. use of neut. of Palládios of Pallas, der. of Pallás, s. Pallad-Pallas

Princeton's WordNet

  1. palladium, Pd, atomic number 46(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

Webster Dictionary

  1. Palladium(noun)

    any statue of the goddess Pallas; esp., the famous statue on the preservation of which depended the safety of ancient Troy

  2. Palladium(noun)

    hence: That which affords effectual protection or security; a sateguard; as, the trial by jury is the palladium of our civil rights

  3. Palladium(noun)

    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

Freebase

  1. Palladium

    Palladium is a chemical element with the chemical symbol Pd and an atomic number of 46. It is a rare and lustrous silvery-white metal discovered in 1803 by William Hyde Wollaston. He named it after the asteroid Pallas, which was itself named after the epithet of the Greek goddess Athena, acquired by her when she slew Pallas. Palladium, platinum, rhodium, ruthenium, iridium and osmium form a group of elements referred to as the platinum group metals. These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them. Over half of the supply of palladium and its congener platinum goes into catalytic converters, which convert up to 90% of harmful gases from auto exhaust into less-harmful substances. Palladium is also used in electronics, dentistry, medicine, hydrogen purification, chemical applications, groundwater treatment and jewelry. Palladium plays a key role in the technology used for fuel cells, which combine hydrogen and oxygen to produce electricity, heat, and water. Ore deposits of palladium and other PGMs are rare, and the most extensive deposits have been found in the norite belt of the Bushveld Igneous Complex covering the Transvaal Basin in South Africa, the Stillwater Complex in Montana, United States, the Thunder Bay District of Ontario, Canada, and the Norilsk Complex in Russia. Recycling is also a source of palladium, mostly from scrapped catalytic converters. The numerous applications and limited supply sources of palladium result in the metal attracting considerable investment interest.

The Nuttall Encyclopedia

  1. Palladium

    a statue of Pallas in Troy, on the preservation of which depended the safety of the city, and from the date of the abstraction of which by Ulysses and Diomedes the fate of it was doomed; it was fabled to have fallen from heaven upon the plain of Troy, and to have after its abstraction been transferred to Athens and Argos; it is now applied to any safeguard of the liberty of a State.

U.S. National Library of Medicine

  1. Palladium

    A chemical element having an atomic weight of 106.4, atomic number of 46, and the symbol Pd. It is a white, ductile metal resembling platinum, and following it in abundance and importance of applications. It is used in dentistry in the form of gold, silver, and copper alloys.

The Standard Electrical Dictionary

  1. Palladium

    A metal of the platinum series. It has the highest power of occlusion, q.v., of all metals. It is the characteristic ingredient of non-magnetic watch alloys. Palladium used as an electrode in the electrolysis of water will occlude 936 volumes of hydrogen, and the hydrogen-palladium alloy will exceed in size the original electrode.


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