Etymology
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sundial (n.)

also sun-dial, 1590s, from sun (n.) + dial (n.). Earlier simply dial.

updated on December 28, 2013

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Definitions of sundial from WordNet

sundial (n.)
timepiece that indicates the daylight hours by the shadow that the gnomon casts on a calibrated dial;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.