substyle

Noun

 * 1) A secondary or subsidiary style.
 * 2) A right line on which the style, or gnomon, of a sundial is erected, being the common section of the face of the dial and a plane perpendicular to it passing through the style.
 * 1) A right line on which the style, or gnomon, of a sundial is erected, being the common section of the face of the dial and a plane perpendicular to it passing through the style.