noun Etymology: International Scientific Vocabulary Date: 1906 spectroheliograph , an instrument similar to a spectroheliograph used for visual as distinguished from photographic observations
SPECTROHELIOSCOPE
Meaning of SPECTROHELIOSCOPE in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012