[ noh-mon ]
/ ˈnoʊ mɒn /


the raised part of a sundial that casts the shadow; a style.
an early astronomical instrument consisting of a vertical shaft, column, or the like, for determining the altitude of the sun or the latitude of a position by measuring the length of its shadow cast at noon.
Geometry. (formerly) the part of a parallelogram that remains after a similar parallelogram has been taken away from one of its corners.

Origin of gnomon

1540–50; < Latin gnōmōn pin of a sundial < Greek gnṓmōn literally, interpreter, discerner Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for gnomon

British Dictionary definitions for gnomon


/ (ˈnəʊmɒn) /


the stationary arm that projects the shadow on a sundial
a geometric figure remaining after a parallelogram has been removed from one corner of a larger parallelogram

Derived Forms

gnomonic, adjectivegnomonically, adverb

Word Origin for gnomon

C16: from Latin, from Greek: interpreter, from gignōskein to know
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012