Gnomon definition

nōmŏn, -mən
The geometric figure that remains after a parallelogram has been removed from a similar but larger parallelogram with which it shares a corner.
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An object, such as the style of a sundial, that projects a shadow used as an indicator.
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A column or pin on a sundial, etc. that casts a shadow indicating the time of day.
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The part of a parallelogram remaining after a similar, smaller parallelogram has been taken from one of its corners.
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The pointer on a sundial.
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(geometry) A plane figure formed by removing a parallelogram from a corner of a larger parallelogram.
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Other Word Forms

Noun

Singular:
gnomon
Plural:
gnomons

Origin of gnomon

  • Latin gnōmōn from Greek interpreter, pointer of a sundial from gignōskein to know gnō- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Latin gnomon, from Ancient Greek γνώμων (gnōmōn, “indicator”), related to γιγνώσκω (gignōskō, “I know”) and γνῶσις (gnōsis, “knowledge”).

    From Wiktionary