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 asa : the pin of a sundialb : 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
Recent Examples of gnomon from the Web
The original clock is missing its gnomon, the part of a sundial that casts a shadow, but an 18th-century museum curator described it having one in the shape of a pig’s tail, so Parslow re-created that, too.
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Origin and Etymology of gnomon
Latin, from Greek gnōmōn interpreter, pointer on a sundial, from gignōskein
First Known Use: 1546See Words from the same year
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