Related Clues:

• Ratio involving a hypotenuse
• Blade in the water
• Trigonometric term
• Rowboat item
• Have a row?
• Ben-Hur was chained to one
• ___ wave
• Sweeping tool
• Paddle alternative
• Lock insert
• A thole holds it
• It may go for a dip in the ocean
• Rower's requirement
• Steering ___
• Paddle, perhaps