To see Multiple Meanings of
ballast
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Multiple Meanings
ballast

Without ballast, the ship will roll too much.
something that helps to stabilize — especially heavy material in the bottom of an empty ship

Less common senses of ballast include:   coarse gravel laid to form a bed for streets and railroads

or:

a resistor inserted into a circuit to compensate for changes (such as is used to start and regulate fluorescent bulbs)
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