Definition of gnomon
1
: an object that by the position or length of its shadow serves as an indicator especially of the hour of the day: such as
a
: the pin of a sundial
b
: a column or shaft erected perpendicular to the horizon
2
: the remainder of a parallelogram after the removal of a similar parallelogram containing one of its corners
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Merriam-Webster unabridged
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Time Traveler for gnomon
The first known use of gnomon was in 1546
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