from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A valve in the hull of a boat or ship that may be opened to let in water so as to flood a ballast tank, for example.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A valve in the hull of a vessel used to let in water, either to clean the bilges, flood a ballast tank, or scuttle the vessel
Sorry, no etymologies found.