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Pronunciation varies by accent · noun
(historical) A double-lens instrument for measuring slight variations of the Sun's diameter by photography, based on the common chord of two overlapping images..
Use photoheliometer when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Photoheliometer means (historical) A double-lens instrument for measuring slight variations of the Sun's diameter by photography, based on the common chord of two overlapping images..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use photoheliometer where its definition matches the intended context.
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