• Noun

    a device for signaling by means of a movable mirror that reflects beams of light, esp. sunlight, to a distance.
    Astronomy . photoheliograph.
    Meteorology . an instrument for recording the duration and intensity of sunshine.
    Photography, Printing . an early type of photoengraving made on a metal plate coated with sensitized asphalt.

    Verb (used with object), verb (used without object)

    to communicate by heliograph.
    Lấy từ « http://tratu.soha.vn/dict/en_en/Heliograph »

    tác giả


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