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substyle

noun sub·style
variants: or substile \ˈsəbzˌtīl, -bˌst-\
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Definition of substyle

: a straight line on which the gnomon of a dial is erected and which constitutes the common section of the face of the dial and a plane perpendicular to it passing through the gnomon

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Origin and Etymology of substyle

sub- + style or obsolete English stile style, from Middle English

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