1. (noun) a resistor inserted into a circuit to compensate for changes (as those arising from temperature fluctuations)

• ballast resistor
• barretter

2. (noun) an electrical device for starting and regulating fluorescent and discharge lamps

• light ballast

1. (noun) any heavy material used to stabilize a ship or airship

• material
• stuff

2. (noun) coarse gravel laid to form a bed for streets and railroads

• crushed rock
• gravel

3. (noun) an attribute that tends to give stability in character and morals; something that steadies the mind or feelings

• attribute

4. (noun) a resistor inserted into a circuit to compensate for changes (as those arising from temperature fluctuations)

• resistance
• resistor

5. (noun) an electrical device for starting and regulating fluorescent and discharge lamps

• electrical device

6. (verb) make steady with a ballast

• brace
• stabilise
• stabilize
• steady