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Pronunciation varies by accent · noun
(historical) A technique for producing of a print of sunspots from a photographic negative using a typographical press..
Use heliotypography when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Heliotypography means (historical) A technique for producing of a print of sunspots from a photographic negative using a typographical press..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use heliotypography where its definition matches the intended context.
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