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2 definitions found
 for Steam whistle
From The Collaborative International Dictionary of English v.0.48 :

  Steam \Steam\ (st[=e]m), n. [OE. stem, steem, vapor, flame, AS.
     ste['a]m vapor, smoke, odor; akin to D. stoom steam, perhaps
     originally, a pillar, or something rising like a pillar; cf.
     Gr. sty`ein to erect, sty^los a pillar, and E. stand.]
     1. The elastic, aeriform fluid into which water is converted
        when heated to the boiling point; water in the state of
        vapor; gaseous water.
        [1913 Webster + PJC]
     2. The mist formed by condensed vapor; visible vapor; -- so
        called in popular usage.
        [1913 Webster]
     3. Any exhalation. "A steam of rich, distilled perfumes."
        [1913 Webster]
     Dry steam, steam which does not contain water held in
        suspension mechanically; -- sometimes applied to
        superheated steam.
     Exhaust steam. See under Exhaust.
     High steam, or High-pressure steam, steam of which the
        pressure greatly exceeds that of the atmosphere.
     Low steam, or Low-pressure steam, steam of which the
        pressure is less than, equal to, or not greatly above,
        that of the atmosphere.
     Saturated steam, steam at the temperature of the boiling
        point which corresponds to its pressure; -- sometimes also
        applied to wet steam.
     Superheated steam, steam heated to a temperature higher
        than the boiling point corresponding to its pressure. It
        can not exist in contact with water, nor contain water,
        and resembles a perfect gas; -- called also surcharged
        steam, anhydrous steam, and steam gas.
     Wet steam, steam which contains water held in suspension
        mechanically; -- called also misty steam.
        [1913 Webster]
     Note: Steam is often used adjectively, and in combination, to
           denote, produced by heat, or operated by power, derived
           from steam, in distinction from other sources of power;
           as in steam boiler or steam-boiler, steam dredger or
           steam-dredger, steam engine or steam-engine, steam
           heat, steam plow or steam-plow, etc.
           [1913 Webster]
     Steam blower.
        (a) A blower for producing a draught consisting of a jet
            or jets of steam in a chimney or under a fire.
        (b) A fan blower driven directly by a steam engine.
     Steam boiler, a boiler for producing steam. See Boiler,
        3, and Note. In the illustration, the shell a of the
        boiler is partly in section, showing the tubes, or flues,
        which the hot gases, from the fire beneath the boiler,
        enter, after traversing the outside of the shell, and
        through which the gases are led to the smoke pipe d, which
        delivers them to the chimney; b is the manhole; c the
        dome; e the steam pipe; f the feed and blow-off pipe; g
        the safety valve; hthe water gauge.
     Steam car, a car driven by steam power, or drawn by a
     Steam carriage, a carriage upon wheels moved on common
        roads by steam.
     Steam casing. See Steam jacket, under Jacket.
     Steam chest, the box or chamber from which steam is
        distributed to the cylinder of a steam engine, steam pump,
        etc., and which usually contains one or more valves; --
        called also valve chest, and valve box. See Illust. of
        Slide valve, under Slide.
     Steam chimney, an annular chamber around the chimney of a
        boiler furnace, for drying steam.
     Steam coil, a coil of pipe, or a collection of connected
        pipes, for containing steam; -- used for heating, drying,
     Steam colors (Calico Printing), colors in which the
        chemical reaction fixing the coloring matter in the fiber
        is produced by steam.
     Steam cylinder, the cylinder of a steam engine, which
        contains the piston. See Illust. of Slide valve, under
     Steam dome (Steam Boilers), a chamber upon the top of the
        boiler, from which steam is conducted to the engine. See
        Illust. of Steam boiler, above.
     Steam fire engine, a fire engine consisting of a steam
        boiler and engine, and pump which is driven by the engine,
        combined and mounted on wheels. It is usually drawn by
        horses, but is sometimes made self-propelling.
     Steam fitter, a fitter of steam pipes.
     Steam fitting, the act or the occupation of a steam fitter;
        also, a pipe fitting for steam pipes.
     Steam gas. See Superheated steam, above.
     Steam gauge, an instrument for indicating the pressure of
        the steam in a boiler. The mercurial steam gauge is a
        bent tube partially filled with mercury, one end of which
        is connected with the boiler while the other is open to
        the air, so that the steam by its pressure raises the
        mercury in the long limb of the tube to a height
        proportioned to that pressure. A more common form,
        especially for high pressures, consists of a spring
        pressed upon by the steam, and connected with the pointer
        of a dial. The spring may be a flattened, bent tube,
        closed at one end, which the entering steam tends to
        straighten, or it may be a diaphragm of elastic metal, or
        a mass of confined air, etc.
     Steam gun, a machine or contrivance from which projectiles
        may be thrown by the elastic force of steam.
     Steam hammer, a hammer for forging, which is worked
        directly by steam; especially, a hammer which is guided
        vertically and operated by a vertical steam cylinder
        located directly over an anvil. In the variety known as
        Nasmyth's, the cylinder is fixed, and the hammer is
        attached to the piston rod. In that known as Condie's, the
        piston is fixed, and the hammer attached to the lower end
        of the cylinder.
     Steam heater.
        (a) A radiator heated by steam.
        (b) An apparatus consisting of a steam boiler, radiator,
            piping, and fixures for warming a house by steam.
     Steam jacket. See under Jacket.
     Steam packet, a packet or vessel propelled by steam, and
        running periodically between certain ports.
     Steam pipe, any pipe for conveying steam; specifically, a
        pipe through which steam is supplied to an engine.
     Steam plow or Steam plough, a plow, or gang of plows,
        moved by a steam engine.
     Steam port, an opening for steam to pass through, as from
        the steam chest into the cylinder.
     Steam power, the force or energy of steam applied to
        produce results; power derived from a steam engine.
     Steam propeller. See Propeller.
     Steam pump, a small pumping engine operated by steam. It is
        usually direct-acting.
     Steam room (Steam Boilers), the space in the boiler above
        the water level, and in the dome, which contains steam.
     Steam table, a table on which are dishes heated by steam
        for keeping food warm in the carving room of a hotel,
        restaurant, etc.
     Steam trap, a self-acting device by means of which water
        that accumulates in a pipe or vessel containing steam will
        be discharged without permitting steam to escape.
     Steam tug, a steam vessel used in towing or propelling
     Steam vessel, a vessel propelled by steam; a steamboat or
        steamship; a steamer.
     Steam whistle, an apparatus attached to a steam boiler, as
        of a locomotive, through which steam is rapidly
        discharged, producing a loud whistle which serves as a
        warning or a signal. The steam issues from a narrow
        annular orifice around the upper edge of the lower cup or
        hemisphere, striking the thin edge of the bell above it,
        and producing sound in the manner of an organ pipe or a
        common whistle.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  steam whistle
      n 1: a whistle in which the sound is produced by steam; usually
           attached to a steam boiler

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