ballast(redirected from Lamp ballast)
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1. Heavy material that is carried to improve stability or maintain proper trim, as on a ship, or to limit buoyancy, as on a balloon.
a. Coarse gravel or crushed rock laid to form a bed for roads or railroads.
b. The gravel ingredient of concrete.
3. Something that gives stability, especially in character.
tr.v. bal·last·ed, bal·last·ing, bal·lasts
1. To stabilize or provide with ballast.
2. To fill (a railroad bed) with or as if with ballast.
1. (Nautical Terms) any dense heavy material, such as lead or iron pigs, used to stabilize a vessel, esp one that is not carrying cargo
2. (Civil Engineering) crushed rock, broken stone, etc, used for the foundation of a road or railway track
3. (Building) coarse aggregate of sandy gravel, used in making concrete
4. anything that provides stability or weight
5. (Electronics) electronics a device for maintaining the current in a circuit
to give stability or weight to
[C16: probably from Low German; related to Old Danish, Old Swedish barlast, literally: bare load (without commercial value), from bar bare, mere + last load, burden]
1. a heavy material carried on a vessel to control draft and stability or a balloon to control altitude.
2. gravel or broken stone placed under the ties of a railroad.
3. a device that maintains the current in an electric circuit at a constant value and may also provide the starting voltage, as in a fluorescent lamp.v.t.
4. to furnish with ballast.
[1520–30; < Middle Low German, perhaps ultimately < Scandinavian; compare early Dan and Swedish barlast=bar bare1 + last load]
Past participle: ballasted
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|Noun||1.||ballast - any heavy material used to stabilize a ship or airship|
|2.||ballast - coarse gravel laid to form a bed for streets and railroads|
|3.||ballast - an attribute that tends to give stability in character and morals; something that steadies the mind or feelings|
attribute - an abstraction belonging to or characteristic of an entity
|4.||ballast - a resistor inserted into a circuit to compensate for changes (as those arising from temperature fluctuations)|
|5.||ballast - an electrical device for starting and regulating fluorescent and discharge lamps|
electrical device - a device that produces or is powered by electricity
|Verb||1.||ballast - make steady with a ballast|