Definition of Helicoid
Hel´i`coid
a.
1.
1.
Spiral
;
curved
,
like
the
spire
of
a
univalve
shell
.
2.
(Zool.)
Shaped
like
a
snail
shell
;
pertaining
to
the
Helicidæ
,
or
Snail
family
.
Helicoid parabola
(Math.)
the
parabolic
spiral
.
n.
1.
(Geom.)
A
warped
surface
which
may
be
generated
by
a
straight
line
moving
in
such
a
manner
that
every
point
of
the
line
shall
have
a
uniform
motion
in
the
direction
of
another
fixed
straight
line
,
and
at
the
same
time
a
uniform
angular
motion
about
it
.
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