Parabolic spiral

a spiral curve conceived to be formed by the periphery of a semiparabola when its axis is wrapped about a circle; also, any other spiral curve having an analogy to the parabola.

parabolic spiral

[¦par·ə¦bäl·ik ′spī·rəl] (mathematics) The curve whose equation in polar coordinates is r ²= a θ.

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