sun·di·al /-ˌdaɪ(ə)l/
日規,日晷
Sun·di·al n. An instrument to show the time of day by means of the shadow of a gnomon, or style, on a plate.
Sundial shell Zool., any shell of the genus Solarium. See Solarium.
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sundial
n : timepiece that indicates the daylight hours by the shadow
that the gnomon casts on a calibrated dial