Definition of Selenium
Se`le´ni`um
n.
1.
(Chem.)
A
nonmetallic
element
of
the
sulphur
group
of
atomic
number
34
,
analogous
to
sulphur
in
its
compounds
.
It
is
found
in
small
quantities
with
sulphur
and
some
sulphur
ores
,
and
obtained
in
the
free
state
as
a
dark
reddish
powder
or
crystalline
mass
,
or
as
a
dark
metallic-looking
substance
.
It
exhibits
under
the
action
of
light
a
remarkable
variation
in
electric
conductivity
,
and
is
used
in
certain
electric
apparatus
.
Symbol
Se
.
Atomic
weight
78
.96.
Related Words
antioxidant
,
atomic
number
34
,
chemical
element
,
element
,
fool
'
s
gold
,
iron
pyrite
,
pyrite
,
Se
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Selenate
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