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gnomon

[noh-mon] /ˈnoʊ mɒn/
noun
1.
the raised part of a sundial that casts the shadow; a style.
2.
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.
3.
Geometry. (formerly) the part of a parallelogram that remains after a similar parallelogram has been taken away from one of its corners.
Origin
1540-1550
1540-50; < Latin gnōmōn pin of a sundial < Greek gnṓmōn literally, interpreter, discerner
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for gnomon
  • The gnomon is simply a straight pole, set vertically in a flat, level patch of ground open to the sun's rays.
British Dictionary definitions for gnomon

gnomon

/ˈnəʊmɒn/
noun
1.
the stationary arm that projects the shadow on a sundial
2.
a geometric figure remaining after a parallelogram has been removed from one corner of a larger parallelogram
Derived Forms
gnomonic, adjective
gnomonically, adverb
Word Origin
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
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Word Origin and History for gnomon
n.

"vertical shaft that tells time by the shadow it casts" (especially the triangular plate on a sundial), 1540s, from Latin gnomon, from Greek gnomon "indicator," literally "one who discerns," from gignoskein "to come to know" (see gnostic (adj.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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9
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