spiral

¹spi·ral

adj \ˈspī-rəl\

Definition of SPIRAL

1

a : winding around a center or pole and gradually receding from or approaching it b : helical <the spiral structure of DNA>

2

: being a fracture in which the break is produced by twisting apart the bone <a double spiral break>

—spi·ral·ly \-rə-lē\ adverb