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Pronunciation varies by accent · noun
An instrument that measures solar radiation from the sun at different wavelengths..
Use spectroheliometer when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Spectroheliometer means An instrument that measures solar radiation from the sun at different wavelengths..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use spectroheliometer where its definition matches the intended context.
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