noun gno·mon \ˈnō-mən, -ˌmän\

Definition of gnomon

  1. 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. 2 :  the remainder of a parallelogram after the removal of a similar parallelogram containing one of its corners

Illustration of gnomon

Origin and Etymology of gnomon

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

First Known Use: 1546

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