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Pronunciation varies by accent · noun
A heliograph, with a camera attached, used to photograph the Sun..
Use photoheliograph when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Photoheliograph means A heliograph, with a camera attached, used to photograph the Sun..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use photoheliograph where its definition matches the intended context.
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