What is the part of a spiral generated in one revolution of the straight line about the pole. See Spiral, n. Spire bearer. (Paleon.) Same as Spirifer called?

spire — (Geom.) The part of a spiral generated in one revolution of the straight line about the pole. See Spiral, n. Spire bearer. (Paleon.) Same as Spirifer. (Webster's 1913.)

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