heliograph

he·li·o·graph  (hl--grf)

n.

1. A device for transmitting messages by reflecting sunlight.

2. A device for photographing the sun.

v. he·li·o·graphed, he·li·o·graph·ing, he·li·o·graphs

v.tr.

To send (a message) by heliograph.

v.intr.

To send a heliograph.

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heli·ogra·pher (-gr-fr) n.

heli·o·graphic adj.

heli·ogra·phy (-gr-f) n.

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heliograph

Noun

an instrument with mirrors and a shutter used for sending messages in Morse code by reflecting the sun's rays [Greek hēlios sun + -graphy]

Thesaurus

Noun	1.	heliograph - an apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on apparatus, setup - equipment designed to serve a specific function
Verb	1.	heliograph - signal by means of a mirror and the using the sun's rays signal, signalise, signalize, sign - communicate silently and non-verbally by signals or signs; "He signed his disapproval with a dismissive hand gesture"; "The diner signaled the waiters to bring the menu"