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BNC: 20248 COCA: 14813

ballast

noun
/ˈbæləst/
/ˈbæləst/
[uncountable]
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  1. heavy material placed in a ship or hot-air balloon to make it heavier and keep it steady(船中保持平衡的)压舱物;(热气球的)镇重物Topics Transport by waterc2
  2. a layer of stones that makes a strong base on which a road, railway, etc. can be built(用作公路或铁路路基的)道砟
  3. Word Originmid 16th cent.: probably of Low German or Scandinavian origin.

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