[N-COUNT 可数名词]日晷 A sundial is a device used for telling the time when the sun is shining. The shadow of an upright rod falls onto a flat surface that is marked with the hours, and points to the correct hour.
Oxford
sun·dial/ˈsʌndaɪəl; NAmEˈsʌndaɪəl/noun _sundial.jpg _sundial.jpg 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. 日规；日晷sundialsundialssun·dial/ˈsʌndaɪəl; NAmEˈsʌndaɪəl/
LDC
sundialsun‧dial /ˈsʌndaɪəl/ noun [countable]
Examples
word sets
sundialan object used in the past for telling the time. The shadow of a pointed piece of metal shows the time and moves round as the sun moves.
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