ballast Definition in the Cambridge English Dictionary
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Definition of “ballast” - English Dictionary

Definition of "ballast" - British English Dictionary

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ballastnoun [U]

uk   us   /ˈbæl.əst/
heavymatter such as ​sand or ​stone that is used at the ​bottom of a ​ship or a hot-air balloon to make it ​heavier, or the ​smallstones on which ​railways and ​roads are made
(Definition of ballast from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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