ballast

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

An electrical device for starting and regulating fluorescent and discharge lamps.

An attribute that tends to give stability in character and morals; something that steadies the mind or feelings.

Any heavy material used to stabilize a ship or airship.

Coarse gravel laid to form a bed for streets and railroads.

Make steady with a ballast.