He″li‐o‐scope (?), n. [Helio- + -scope: cf. F. hélioscope.] (Astron.) A telescope or instrument for viewing the sun without injury to the eyes, as through colored glasses, or with mirrors which reflect but a small portion of light. — He′li‐o‐scop′ic (#), a.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.