palladium 音标拼音: [pəl'ediəm]
n . 钯
钯
palladium n 1 :
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 [
synonym : {
palladium }, {
Pd },
{
atomic number 46 }]
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 ]
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 ]
Pd \
Pd \
prop .
n .
The chemical symbol for {
palladium },
an element of the platinum group ,
of atomic number 46 .
Syn :
palladium .
[
WordNet 1 .
5 ]
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
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