An upside down midair 360° spin in playboating.
A curve on the surface of a cylinder or cone such that its angle to a plane perpendicular to the axis is constant; the three-dimensional curve seen in a screw or a spiral staircase.
A small volute under the abacus of a Corinthian capital.
The incurved rim of the external ear.
To form or cause to form a helix.
A boat propelled by a paddlewheel.
A large wheel fitted with thick slats, turned by an engine and used to propel a boat.