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gnomon noun

  /ˈnoʊ.mən/ , /ˈnoʊˌmɑn/ , /ˈnəʊ.mən/ , /ˈnəʊˌmɒn/
  • An object such as a pillar or a rod that is used to tell time by the shadow it casts when the sun shines on it, especially the pointer on a sundial. [from mid 16th c.]
 γνώμονας

gnomonics noun

  /nəʊˈmɒnɪks/
  • The science, art and craft of designing and constructing sundials.
 γνωμονική
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