gnomonic

gnomon

gno·mon

G0166900 (nō′mŏn′, -mən)n.1. An object, such as the style of a sundial, that projects a shadow used as an indicator.2. 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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[Latin gnōmōn, from Greek, interpreter, pointer of a sundial, from gignōskein, to know; see gnō- in Indo-European roots.]

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gno·mon′ic, gno·mon′i·cal adj.