transcription, транскрипция: [ ˈrə-dər ]
noun
Etymology: Middle English rother, from Old English rōther paddle; akin to Old English rōwan to row
Date: 14th century
1. : an underwater blade that is positioned at the stern of a boat or ship and controlled by its helm and that when turned causes the vessel's head to turn in the same direction
2. : a movable auxiliary airfoil on an airplane usually attached at the rear end that serves to control direction of flight in the horizontal plane — see airplane illustration
3. : a guiding force or strategy
• rud·der·less -ləs adjective