Meaning of “ballast” in the English Dictionary

british dictionary

"ballast" in British English

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ballastnoun [ U ]

uk /ˈbæl.əst/ us /ˈbæl.əst/

heavy matter 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 small stones on which railways and roads are made

(Definition of “ballast” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)