grapnel/ˈgræpnəl; `ɡræpnəl/ n(nautical 海)1 (formerly) instrument with hooks for holding an enemy ship in order to climb on board （旧时）多爪钩（用以钩住敌船的工具）.2 hooked anchor for holding a boat still, esp in a lake, river, etc 多爪锚. =>illus 见插图.
牛津英汉双解词典