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A gnomon (/ˈnoʊˌmɒn, -mən/; from Ancient Greek γνώμων (gnṓmōn) 'one that knows or examines')[1][2] is the part of a sundial that casts a shadow. The term is used for a variety of purposes in mathematics and other fields.
- ^ γνώμων. Liddell, Henry George; Scott, Robert; A Greek–English Lexicon at the Perseus Project.
- ^ Harper, Douglas. "gnomon". Online Etymology Dictionary.