helioscopy

helioscope

[hee-lee-uh-skohp]
noun
a telescope for viewing the sun, adapted to protect the eye of the viewer from the sun's glare.

Origin:
1665–75; helio- + -scope

helioscopic [hee-lee-uh-skop-ik] , adjective
helioscopy [hee-lee-os-kuh-pee] , noun
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