Reference meaning
helioscope
Last updated
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.
Source and scope
This definition is reproduced from English Wiktionary, sense en-helioscope-en-noun-RESCQSpd, under the CC BY-SA 4.0. It has not yet received VocabularyBase editorial review. Read the source and license details.