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oxygen
noun
-
oxygen
a
colorless
,
odorless
gas
(
chemical
symbol
O
)
that
makes
up
about
one-fifth
of
the
air
and
is
essential
for
breathing
,
combustion
,
and
many
chemical
reactions
.
•
Deep-sea
divers
carry
tanks
filled
with
oxygen
so
they
can
breathe
underwater
.
Deep-sea
divers
carry
tanks
filled
with
oxygen
so
they
can
breathe
underwater
.
•
During
science
class
,
the
teacher
showed
how
burning
a
candle
uses
up
the
oxygen
in
a
closed
jar
.
During
science
class
,
the
teacher
showed
how
burning
a
candle
uses
up
the
oxygen
in
a
closed
jar
.
Coined
in
the
late
18th
century
from
French
‘
oxygène
’,
formed
from
Greek
‘
oxys
’
meaning
‘
sharp
,
acid
’
and
‘
-genes
’
meaning
‘
producer
’,
because
early
chemists
mistakenly
thought
it
was
necessary
to
make
acids
.
noun
-
oxygen
something
that
is
vitally
needed
to
keep
an
activity
,
system
,
or
feeling
alive
and
successful
.
•
Freedom
of
the
press
is
the
oxygen
of
a
healthy
democracy
.
Freedom
of
the
press
is
the
oxygen
of
a
healthy
democracy
.
•
For
many
artists
,
inspiration
is
the
oxygen
that
fuels
their
creativity
.
For
many
artists
,
inspiration
is
the
oxygen
that
fuels
their
creativity
.
