heliograph

/ˌhilioʊˈgræf/
IPA guide

Other forms: heliographed; heliographing; heliographs

Definitions of heliograph
  1. noun
    an apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on
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    type of:
    apparatus, setup
    equipment designed to serve a specific function
  2. verb
    signal by means of a mirror and the using the sun's rays
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    type of:
    sign, signal, signalise, signalize
    communicate silently and non-verbally by signals or signs
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