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Pronunciation varies by accent · noun
(astronomy) An apparatus for viewing the Sun without harming the eye, by means of an optical filter that attenuates most of the sunlight while allowing only a small amount of the solar radiation..
Use helioscope when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Helioscope means (astronomy) An apparatus for viewing the Sun without harming the eye, by means of an optical filter that attenuates most of the sunlight while allowing only a small amount of the solar radiation..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use helioscope where its definition matches the intended context.
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