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English definition of “sundial”

sundial

noun [C] uk   /ˈsʌn.daɪl/ us  
a device used outside, especially in the past, which consists of a thin piece of metal attached to a flat surface printed with numbers. It shows the time by the metal making a dark line on the surface as the sun moves across the sky.
(Definition of sundial from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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