Term: Sea Cock Image: [{"name":"images\/public\/dictionary\/seacock_trds5wp7.jpg","usrName":"seacock.jpg","size":502431,"type":"image\/jpeg","thumbnail":"images\/public\/dictionary\/thseacock_4j38tr91.jpg","thumbnail_type":"image\/jpeg","thumbnail_size":30314,"searchStr":"seacock.jpg,!:sStrEnd"}] Definition: A valve in an opening through a ship's hull below or near the waterline (especially one connecting a ship's engine-cooling system to the sea).