Definition of sundial noun from the Oxford Advanced Learner's Dictionary

 

sundial

 noun
noun
BrE BrE//ˈsʌndaɪəl//
 
; NAmE NAmE//ˈsʌndaɪəl//
 
In the garden
 
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a device used outdoors, especially in the past, for telling the time when the sun is shining. A pointed piece of metal throws a shadow on a flat surface that is marked with the hours like a clock, and the shadow moves around as the sun moves across the sky. See related entries: In the garden
See the Oxford Advanced American Dictionary entry: sundial