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
Thesaurus: synonyms and related words
Mass, area, weight & volume in general
- A2
- A3
- A4
- A5
- area
- dead weight
- density
- displacement
- legal
- letter
- mass
- specific gravity
- sq
- square
- tare
- volume
- weight
You can also find related words, phrases, and synonyms in the topics:
Railways & railway lines
Parts of ships & boats