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helioscope

[hee-lee-uh-skohp]

noun

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

Origin:
1665–75; helio- + -scope

Related forms

he·li·o·scop·ic

[hee-lee-uh-skop-ik] , adjective

he·li·os·co·py

[hee-lee-os-kuh-pee] , noun

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Helioscope is always a great word to know.

So is doohickey. Does it mean:

a gadget; dingus; thingumbob.

a fool or simpleton; ninny.

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People who can define Helioscope may know 42,065 words, as many as a 11th grader.

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