Hypertext Webster Gateway: "substyle"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Substyle \Sub"style`\, n. (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.
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