Noun
A
line
that
is
tangent
to
the
velocity
of
flow
of
a
fluid
;
equivalent
to
the
path
of
a
specific
particle
in
that
flow
.
Verb
To
design
and
construct
the
contours
of
a
vehicle
etc
.
so
as
to
offer
the
least
resistance
to
its
flow
through
a
fluid
.