gnomon

noun gno·mon \ ˈnō-mən , -ˌmän \

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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Illustration of gnomon

Origin and Etymology of gnomon

Latin, from Greek gnōmōn interpreter, pointer on a sundial, from gignōskein


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