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1 definition found

From: Webster's Revised Unabridged Dictionary (1913)

 Hel·i·coid a.
 1. Spiral; curved, like the spire of a univalve shell.
 2. Zool. Shaped like a snail shell; pertaining to the Helicidae, or Snail family.
 Helicoid parabola Math., the parabolic spiral.