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]