Palladium

6 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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, with
     a melting point of 1555[deg] 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.
     [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Palladium \Pal*la"di*um\ (p[a^]l*l[=a]"d[i^]*[u^]m), n. [L., fr.
     Gr. Palla`dion, fr. Palla`s, Palla`dos, Pallas.]
     [1913 Webster]
     1. (Gr. Antiq.) Any statue of the goddess Pallas; esp., the
        famous statue on the preservation of which depended the
        safety of ancient Troy.
        [1913 Webster]
  
     2. Hence: That which affords effectual protection or
        security; a safeguard; as, the trial by jury is the
        palladium of our civil rights. --Blackstone.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Pd \Pd\ prop. n.
     The chemical symbol for {palladium}, an element of the
     platinum group, of atomic number 46.
  
     Syn: palladium.
          [WordNet 1.5]

From WordNet (r) 2.0 [wn]:

  palladium
       n : 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 [syn: {Pd}, {atomic
           number 46}]

From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:

  61 Moby Thesaurus words for "palladium":
     aegis, arm guard, backstop, buffer, bulwark, bumper, contraceptive,
     copyright, crash helmet, cushion, dashboard, dodger, face mask,
     fender, finger guard, foot guard, fuse, goggles, governor, guard,
     guardrail, hand guard, handrail, hard hat, helmet, insulation,
     interlock, knee guard, knuckle guard, laminated glass,
     life preserver, lifeline, lightning conductor, lightning rod, mask,
     mudguard, nose guard, pad, padding, patent, pilot, preventive,
     prophylactic, protective clothing, protective umbrella, safeguard,
     safety, safety glass, safety plug, safety rail, safety shoes,
     safety switch, safety valve, screen, seat belt, shield, shin guard,
     sun helmet, umbrella, windscreen, windshield
  
  

From Elements database 20001107 [elements]:

  palladium
  Symbol: Pd
  Atomic number: 46
  Atomic weight: 106.4
  Soft white ductile transition element. Found with some copper and nickel
  ores. Does not react with oxygen at normal temperatures. Dissolves slowly
  in hydrochloric acid. Discovered in 1803 by W.H. Wollaston.