Substyle

• (n.) A right line on which the style, or gnomon, of a dial is erected; being the common section of the face of the dial and a plane perpendicular to it passing through the style.
Found on http://thinkexist.com/dictionary/meaning/substyle/

Substyle

Sub'style` noun (Dialing) A right line on which the style, or gnomon, of a dial is erected; being the common section of the face of the dial and a plane perpendicular to it passing through the style. [ Written also substile .] Hutton.
Found on http://www.encyclo.co.uk/webster/S/228
No exact match found