Definition of iridium
i`rid´i`um
Pronunciation:
î`rĭd´ĭ`ŭm
n.
1.
(Chem.)
A
rare
metallic
element
of
atomic
number
77
,
of
the
same
group
as
platinum
,
which
it
much
resembles
,
being
silver-white
and
indifferent
to
most
corrosive
agents
,
but
harder
,
more
brittle
,
and
with
a
higher
melting
temperature
(2410°
C
,
versus
platinum
1772°
C
).
With
the
exception
of
osmium
,
it
is
the
heaviest
substance
known
,
its
specific
gravity
being
22
.
4
.
Symbol
Ir
.
Atomic
weight
192
.
22
.
Related Words
atomic
number
77
,
Ir
,
metal
,
metallic
element
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