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fluid
noun
a
substance
,
such
as
a
liquid
or
gas
,
that
flows
easily
and
takes
the
shape
of
its
container
•
He
checked
the
car's
fluid
levels
before
the
long
trip
.
He
checked
the
car's
fluid
levels
before
the
long
trip
.
•
Water
,
oil
,
and
air
are
all
types
of
fluids
.
Water
,
oil
,
and
air
are
all
types
of
fluids
.
