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    bal·last
    [ˈbaləst]
    noun
    ballast (noun) · ballasts (plural noun)
    1. heavy material, such as gravel, sand, iron, or lead, placed low in a vessel to improve its stability:
      "the hull had insufficient ballast"
      Image of ballast
      Image of ballast
      Image of ballast
      Image of ballast
    2. gravel or coarse stone used to form the bed of a railroad track or road:
      "a thick layer of railroad ballast"
      • a mixture of coarse and fine aggregate for making concrete.
    3. a passive component used in an electric circuit to moderate changes in current:
      "ballasts are permanently wired into existing fixtures" · "ballast resistors"
    verb
    (be ballasted)
    ballast (verb) · ballasts (third person present) · ballasted (past tense) · ballasted (past participle) · ballasting (present participle)
    1. give stability to (a ship) by putting a heavy substance in its bilge:
      "the vessel has been ballasted to give the necessary floating stability"
    2. form (the bed of a railroad line or road) with gravel or coarse stone:
      "the track was laid with rails and ballasted with earth"
    Origin
    mid 16th century: probably of Low German or Scandinavian origin.
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    Ballast is any heavy material used to stabilize a vessel, a balloon, a railroad, or an electrical circuit. It can also mean something that gives mental, moral, or political stability or steadiness.

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