Hē'li-o-scōpe, n.

[Fr. hélioscope: Gr. ἥλιος, the sun, and σκοπεῖν, radix σκεπ, to look carefully, to spy.] (Astron.) A telescope fitted for viewing the sun without injury to the eyes, as when made with colored glasses, or with mirrors formed simply of surfaces of transparent glass, which reflect but a small portion of light.