1 definition found From The Collaborative International Dictionary of English v.0.48 [gcide]: Helioscope \He"li*o*scope\, n. [Helio- + -scope: cf. F. h['e]lioscope.] (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. [1913 Webster]
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