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Consult Chambers 21st Century Dictionary, The Chambers Thesaurus (1996) or Chambers Biographical Dictionary (1997 edition with amendments). Enter your search and choose your title from the drop-down menu.

Search results for 'gnomon':

gnomon noun 1 on a sundial: the raised arm that casts the shadow which points to the hour. 2 math the remainder of a parallelogram after a similar parallelogram has been removed from one corner.
ETYMOLOGY: 16c: Greek, in sense 1.