sundial

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sun·di·al / ˈsənˌdīl/ • n. 1. an instrument showing the time by the shadow of a pointer cast by the sun onto a plate marked with the hours of the day. 2. (also sundial shell) a mollusk (family Architectonicidae) with a flattened spiral shell that is typically patterned in shades of brown, living in tropical and subtropical seas.

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