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sundial

noun [C]
 
 
/ˈsʌn.daɪl/

Definition

a device used outside, especially in the past, which consists of a thin piece of metal fixed 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.Watches and clocks
(Definition of sundial noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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