gnomon /nōˈmon/

1. The pin of a sundial, whose shadow points to the hour
2. An upright rod for taking the sun's altitude by its shadow
3. That which remains of a parallelogram when a similar parallelogram within one of its angles is taken away (geometry)
4. A geometrical figure which, added to or subtracted from another, gives a figure similar to the original one
5. An index or indicator (obsolete)
6. The nose (obsolete; joc)

gnomonic or gnomonical /-monˈ/ adjective

Relating to a gnomon or to the art of gnomonics

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