\Rud"der\, n.
In an aircraft, a surface the function of which is to exert a
turning moment about an axis of the craft.

\Rud"der\, n.
A riddle or sieve. [Prov. Eng.]

\Rud"der\, n. [OE. rother, AS. r[=o][eth]er a paddle;
akin to D. roer rudder, oar, G. ruder, OHG. roadar, Sw.
roder, ror, Dan. roer, ror. [root] 8. See {Row} to propel
with an oar, and cf. {Rother}. ]
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.
{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}. (Zo["o]l.)
   (a) 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.

3. A dish or utensil (originally fashioned like the hull of a
   ship) used to hold incense. [Obs.] --Tyndale.
{Armed ship}, a private ship taken into the service of the
   government in time of war, and armed and equipped like a
   ship of war. [Eng.] --Brande & C.
{General ship}. See under {General}.
{Ship biscuit}, hard biscuit prepared for use on shipboard;
   -- called also {ship bread}. See {Hardtack}.
{Ship boy}, a boy who serves in a ship. ``Seal up the ship
   boy's eyes.'' --Shak.
{Ship breaker}, one who breaks up vessels when unfit for
   further use.
{Ship broker}, a mercantile agent employed in buying and
   selling ships, procuring cargoes, etc., and generally in
   transacting the business of a ship or ships when in port.
{Ship canal}, a canal suitable for the passage of seagoing
   vessels.
{Ship carpenter}, a carpenter who works at shipbuilding; a
   shipwright.
{Ship chandler}, one who deals in cordage, canvas, and other,
   furniture of vessels.
{Ship chandlery}, the commodities in which a ship chandler
   deals; also, the business of a ship chandler.
{Ship fever} (Med.), a form of typhus fever; -- called also
   {putrid, jail, or hospital fever}.
{Ship joiner}, a joiner who works upon ships.
{Ship letter}, a letter conveyed by a ship not a mail packet.
{Ship money} (Eng. Hist.), an imposition formerly charged on
   the ports, towns, cities, boroughs, and counties, of
   England, for providing and furnishing certain ships for
   the king's service. The attempt made by Charles I. to
   revive and enforce this tax was resisted by John Hampden,
   and was one of the causes which led to the death of
   Charles. It was finally abolished.
{Ship of the line}. See under {Line}.
{Ship pendulum}, a pendulum hung amidships to show the extent
   of the rolling and pitching of a vessel.
{Ship railway}.
   (a) An inclined railway with a cradelike car, by means of
       which a ship may be drawn out of water, as for
       repairs.
   (b) A railway arranged for the transportation of vessels
       overland between two water courses or harbors.
{Ship's company}, the crew of a ship or other vessel.
{Ship's days}, the days allowed a vessel for loading or
   unloading.
{Ship's husband}. See under {Husband}.
{Ship's papers} (Mar. Law), papers with which a vessel is
   required by law to be provided, and the production of
   which may be required on certain occasions. Among these
   papers are the register, passport or sea letter, charter
   party, bills of lading, invoice, log book, muster roll,
   bill of health, etc. --Bouvier. --Kent.
{To make ship}, to embark in a ship or other vessel.