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From helio- +‎ -graph.


heliograph (plural heliographs)

  1. An apparatus for signalling by means of a moveable mirror which reflects flashes of sunlight.
    • 1979, Alasdair Gray, ‘Five Letters From an Eastern Empire’, Canongate 2012 (Every Short Story 1951-2012), p. 93:
      when we stood up at nightfall we saw, in the sunset, the sparkle of the heliograph above cities, on the far side of the horizon.
  2. A heliogram.
  3. An instrument for measuring the intensity of sunlight.
  4. A device for photographing the sun.
  5. (obsolete) A photograph.


heliograph (third-person singular simple present heliographs, present participle heliographing, simple past and past participle heliographed)

  1. (transitive) To send a message by heliograph.
  2. (intransitive) To send a heliograph.
  3. (transitive, dated) To photograph by sunlight.

Derived terms[edit]