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What is "helicoid parabola"

The Collaborative International Dictionary
Helicoid parabola

Helicoid \Hel"i*coid\, a. [Gr. ?; ?, ?, spiral + ? shape: cf. F. h['e]lico["i]de. See Helix.]

  1. Spiral; curved, like the spire of a univalve shell.

  2. (Zo["o]l.) Shaped like a snail shell; pertaining to the Helicid[ae], or Snail family.

    Helicoid parabola (Math.), the parabolic spiral.