a valve in the hull of a vessel for admitting outside water into some part of the hull, as a ballast tank.
Origin of seacock
Also called sea connection.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for seacock
Historical Examples of seacock
The fireroom is full of water; but it looks to me as though a seacock had been opened.Ruth Fielding Homeward Bound
Alice B. Emerson
nautical a valve in the hull of a vessel below the water line for admitting sea water or for pumping out bilge water
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012