Definition of Rudder
Rud´der
n.
1.
A
riddle
or
sieve
.
1.
(Naut.)
The
mechanical
appliance
by
means
of
which
a
vessel
is
guided
or
steered
when
in
motion
.
It
is
a
broad
and
flat
blade
made
of
wood
or
iron
,
with
a
long
shank
,
and
is
fastened
in
an
upright
position
,
usually
by
one
edge
,
to
the
sternpost
of
the
vessel
in
such
a
way
that
it
can
be
turned
from
side
to
side
in
the
water
by
means
of
a
tiller
,
wheel
,
or
other
attachment
.
2.
Fig
.:
That
which
resembles
a
rudder
as
a
guide
or
governor
;
that
which
guides
or
governs
the
course
.
For
rhyme
the
rudder
is
of
verses
.
- Hudibras.
3.
In
an
aircraft
,
a
surface
the
function
of
which
is
to
exert
a
turning
moment
about
an
axis
of
the
craft
.
Balance rudder
(Naut.)
a
rudder
pivoted
near
the
middle
instead
of
at
the
edge
, -
common
on
sharpies
.
Drop rudder
(Naut.)
a
rudder
extending
below
the
keel
so
as
to
be
more
effective
in
steering
.
Rudder chain
(Naut.)
one
of
the
loose
chains
or
ropes
which
fasten
the
rudder
to
the
quarters
to
prevent
its
loss
in
case
it
gets
unshipped
,
and
for
operating
it
in
case
the
tiller
or
the
wheel
is
broken
.
Rudder coat
(Naut.)
a
covering
of
tarred
canvas
used
to
prevent
water
from
entering
the
rudderhole
.
Rudder fish
a
-
(Zool.)
The
pilot
fish
b
-
The
amber
fish
(
Seriola
zonata
),
which
is
bluish
having
six
broad
black
bands
c
-
A
plain
greenish
black
American
fish
(
Leirus
perciformis
); -
called
also
black rudder fish
,
logfish
,
and
barrel fish
.
The
name
is
also
applied
to
other
fishes
which
follow
vessels
.
Rudder pendants
(Naut.)
ropes
connected
with
the
rudder
chains
.
Related Words
aerofoil
,
airfoil
,
control
surface
,
surface
,
vertical
tail
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