- ballast - any heavy material used to stabilize a ship or airship
--1 is a kind of substance, matter
Derived form: verb ballast1 - ballast - coarse gravel laid to form a bed for streets and railroads
--2 is a kind of gravel, crushed rock
- ballast - an attribute that tends to give stability in character and morals; something that steadies the mind or feelings
--3 is a kind of attribute
- ballast resistor, ballast, barretter - a resistor inserted into a circuit to compensate for changes (as those arising from temperature fluctuations)
--4 is a kind of resistor, resistance
- ballast, light ballast - an electrical device for starting and regulating fluorescent and discharge lamps
--5 is a kind of electrical device
- ballast - an attribute that tends to give stability in character and morals; something that steadies the mind or feelings