• synonyms


  1. a telescope for viewing the sun, adapted to protect the eye of the viewer from the sun's glare.
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Origin of helioscope

First recorded in 1665–75; helio- + -scope
Related formshe·li·o·scop·ic [hee-lee-uh-skop-ik] /ˌhi li əˈskɒp ɪk/, adjectivehe·li·os·co·py [hee-lee-os-kuh-pee] /ˌhi liˈɒs kə pi/, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for helioscope

Historical Examples

  • To the "helioscope" employed by Father Scheiner two centuries and a quarter earlier, a species of micrometer was added.

    A Popular History of Astronomy During the Nineteenth Century

    Agnes M. (Agnes Mary) Clerke

  • A few words must here be said concerning the helioscope, which on more than one occasion played a prominent part in this war.