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helicoid a. 螺旋狀的,蝸牛殼狀的,回轉式的
n. 螺旋體,螺旋面 螺旋狀的,蝸牛殼狀的,回轉式的螺旋體,螺旋面 helicoid 螺旋面 Helicoid \Hel"i*coid\, a. [Gr. ?; ?, ?, spiral ? shape: cf. F.
h['e]lico["i]de. See {Helix}.] [1913 Webster] 1. Spiral; curved, like the spire of a univalve shell. [1913 Webster] 2. (Zool.) Shaped like a snail shell; pertaining to the {Helicid[ae]}, or Snail family. [1913 Webster] {Helicoid parabola} (Math.), the parabolic spiral. [1913 Webster] Helicoid \Hel"i*coid\, n. (Geom.) A warped surface which may be generated by a straight line moving in such a manner that every point of the line shall have a uniform motion in the direction of another fixed straight line, and at the same time a uniform angular motion about it. [1913 Webster]
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