[f. SPIRAL a.1 + -ITY.] Spiral character; the degree of a spiral curve.
a. 1858. in Greener, Gunnery, 407. The tendency of a bullet to twist the rifle on one side is now avoided by reducing the spirality of the grooves.
1884. Science, III. 583/2. The better the [cotton] fibre, the more perfect its spirality.
