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molecule
noun
the
smallest
particle
of
a
substance
that
can
exist
on
its
own
,
formed
when
two
or
more
atoms
join
together
and
still
keeping
all
the
substance
’
s
chemical
properties
•
A
single
molecule
of
water
is
made
of
two
hydrogen
atoms
and
one
oxygen
atom
.
A
single
molecule
of
water
is
made
of
two
hydrogen
atoms
and
one
oxygen
atom
.
•
Under
the
microscope
,
the
researcher
watched
how
each
molecule
reacted
to
the
laser
light
.
Under
the
microscope
,
the
researcher
watched
how
each
molecule
reacted
to
the
laser
light
.
Early
18th
century
:
from
French
molécule
,
from
modern
Latin
molecula
‘
small
mass
’,
diminutive
of
Latin
moles
‘
mass
’.
noun
a
very
small
amount
of
something
,
used
for
emphasis
•
There
isn
’
t
a
molecule
of
evidence
to
support
that
rumor
.
There
isn
’
t
a
molecule
of
evidence
to
support
that
rumor
.
•
She
performed
on
stage
without
a
molecule
of
fear
.
She
performed
on
stage
without
a
molecule
of
fear
.
