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Ballast

From Biology-Online Dictionary | Biology-Online Dictionary
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Ballast

1. To steady, as a vessel, by putting heavy substances in the hold.

2. To fill in, as the bed of a railroad, with gravel, stone, etc, in order to make it firm and solid.

3. To keep steady; to steady, morally. 'T is charity must ballast the heart. (Hammond)

Origin: Ballasted; Ballasting.