Definition for SPI'RAL

SPI'RAL, a. [It. spirale; Fr. spiral; from L. spira, a spire.]

Winding round a cylinder or other round body, or in a circular form, and at the same time rising or advancing forward; winding like a screw. The magnificent column in the Place Vendome, at Paris, is divided by a spiral line into compartments. It is formed with spiral compartments, on which are engraved figures emblematical of the victories of the French armies. A whirlwind is so named from the spiral motion of the air.

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