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sundial

[suhn-dahy-uh l, -dahyl] /ˈsʌnˌdaɪ əl, -ˌdaɪl/
noun
1.
an instrument that indicates the time of day by means of the position, on a graduated plate or surface, of the shadow of the gnomon as it is cast by the sun.
Origin
1570-1580
1570-80; sun + dial
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sun dial

sundial

/ˈsʌnˌdaɪəl/
noun
1.
a device indicating the time during the hours of sunlight by means of a stationary arm (the gnomon) that casts a shadow onto a plate or surface marked in hours
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for sun dial

sundial

n.

1590s, from sun (n.) + dial (n.).

Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Article for sun dial

sundial

the earliest type of timekeeping device, which indicates the time of day by the position of the shadow of some object exposed to the Sun's rays. As the day progresses, the Sun moves across the sky, causing the shadow of the object to move and indicating the passage of time. .

Learn more about sundial with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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3
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