2. (Zo["o]l.) Shaped like a snail shell; pertaining to the
{Helicid[ae]}, or Snail family.
[1913 Webster]
{Helicoid parabola} (Math.), the parabolic spiral. [1913 Webster]
The Collaborative International Dictionary of English. 2000.
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. (Zo[ o]l.) Shaped like a snail shell; pertaining to the {Helicid[ae]}, or … The Collaborative International Dictionary of English
Multivariable calculus — Topics in Calculus Fundamental theorem Limits of functions Continuity Mean value theorem Differential calculus Derivative Change of variables Implicit differentiation Taylor s theorem Related rates … Wikipedia
Integral of secant cubed — One of the more challenging indefinite integrals of elementary calculus is:int sec^3 x , dx = frac{1}{2}sec x an x + frac{1}{2}ln|sec x + an x| + C.There are a number of reasons why this particular antiderivative is worthy of special attention:*… … Wikipedia
