- An apparatus for seeing sunlight without injuring the eye.
- A telescope or instrument for watching the sun without injury to the eyes, as through colored glasses, or with mirrors which reflect but a tiny percentage of light.
- a type of telescope fitted for watching sunlight without pain or injury to the eyes, as an instrument created using coloured specs or eyeglasses blackened by smoke, or with mirrors formed merely of areas of clear glass, which mirror but a little proportion of light.
Sentence for "helioscope"
- Modern telescopes on display include a…
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