- a column or pin on a sundial, etc. that casts a shadow indicating the time of day
- the part of a parallelogram remaining after a similar, smaller parallelogram has been taken from one of its corners
Origin of gnomonClassical Latin from Classical Greek gn?m?n, one who knows or examines, index of a sundial from base of gign?skein, to know
- An object, such as the style of a sundial, that projects a shadow used as an indicator.
- The geometric figure that remains after a parallelogram has been removed from a similar but larger parallelogram with which it shares a corner.
Origin of gnomonLatin gnōmōn from Greek interpreter, pointer of a sundial from gignōskein to know ; see gnō- in Indo-European roots.
- gno·mon′ic gno·mon′i·cal
top: on a sundial
bottom: A gnomon of the parallelogram ABCD is the shaded figure HBCDKL.
From Latin gnomon, from Ancient Greek γνώμων (gnōmōn, “indicator”), related to γιγνώσκω (gignōskō, “I know”) and γνῶσις (gnōsis, “knowledge”).