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Noun: heliograph  'hee-lee-u,grãf
  1. An apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on
Verb: heliograph  'hee-lee-u,grãf
  1. Signal by means of a mirror and the using the sun's rays

Derived forms: heliographing, heliographed, heliographs

Type of: apparatus, setup, sign, signal, signalise [Brit], signalize

Encyclopedia: Heliograph