HELIOGRAPH


Meaning of HELIOGRAPH in English

/ ˈhiːliəgrɑːf; NAmE -græf/ noun

1.

a device which gives signals by reflecting flashes of light from the sun

2.

(also he·lio·gram / ˈhiːliəgræm/) a message which is sent using signals from a heliograph

3.

a special camera which takes photographs of the sun

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.