IPA: /ˈsiːkɒk/
KK: /ˈsiːkɒk/
A valve located in the hull of a boat or ship that can be opened to allow water to enter, often used for filling a ballast tank.
The sailor checked the seacock to ensure it was closed before setting sail.
The word 'seacock' is formed from 'sea' (from Old English 'sǣ', meaning the ocean or large body of saltwater) and 'cock' (from Old English 'coc', meaning a valve or tap). A seacock refers to a valve used to control the flow of water in and out of a boat, particularly in relation to the sea.
Think of the 'sea' as the large body of water and 'cock' as a valve that controls it — a seacock is a valve that manages water flow from the sea.