DICTIONARY

Definition of HELIOGRAPH

noun : HELIOGRAPH

Source: WordNet 3.1

  • 1. (

    ) an apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on ;

verb : HELIOGRAPH

Source: WordNet 3.1

  • 1. (

    ) signal by means of a mirror and the using the sun's rays ;

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