sundial

[suhn-dahy-uhl, -dahyl]

sun·di·al

[suhn-dahy-uhl, -dahyl]
noun
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:
1570–80; sun + dial
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Sundial is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a chattering or flighty, light-headed person.
Collins
World English Dictionary
sundial (ˈsʌnˌdaɪəl)
 
n
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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Encyclopedia Britannica
Encyclopedia

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. .

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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