Hovering and Convolution

(p.pr.&vb.n.) of Hover.

(DoD) A self-sustaining maneuver whereby a fixed, or nearly fixed, position is maintained relative to a spot on the surface of the Earth or underwater.

noun

• The shape of something rotating rapidly.
  • synonyms: whirl, swirl, vortex
• A convex fold or elevation in the surface of the brain.
  • synonyms: gyrus
• The action of coiling or twisting or winding together. .

• (n.) An irregular, tortuous folding of an organ or part; as, the convolutions of the intestines; the cerebral convolutions. See Brain.
• (n.) The state of being rolled upon itself or rolled or doubled together; a tortuous or sinuous winding or fold, as of something rolled or folded upon itself.
• (n.) The act of rolling anything upon itself or one thing upon another; a winding motion.