Definitions

1. noun

A three-dimensional shape formed by a right circular cylinder whose plane has rotated about an axis in its plane by a complete revolution, or a surface of revolution generated by a right circular cylinder.

“The engineer studied the helicoid curves of the spiral staircase.”

2. adjective

Relating to or resembling a helicoid, especially in having a spiral or helical shape.

“The helicoid pattern on the seashell added to its unique beauty.”