A plane curve traced by a point circling about the center but at increasing distances from the center.
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"Spiral" Quotes from Famous Books — Our Bird Comrades • Leander S. (Leander Sylvester) Keyser — The Ragged Trousered Philanthropists • Robert Tressell — Middy and Ensign • G. Manville Fenn — Rollo in Scotland • Jacob Abbott — Scientific American Supplement, No. 415, December 15, 1883 • Various |
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