A person who makes or designs dials, or someone who studies and describes time-telling devices like sundials.
From dial + -ist (one who practices or specializes in). Dial comes from Latin dialis (daily) or from the mechanical device. The -ist suffix creates a noun for a person with expertise in this area.
Medieval 'dialists' were like the engineers of their time—they combined mathematics, astronomy, and craftsmanship to build sundials that could accurately track time using only the sun's shadow.
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