heliogram

heliogram

[hee-lee-uh-gram]
noun
a message sent by a heliograph.

Origin:
1880–85; helio- + -gram1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
heliogram

noun
a message transmitted by means of the sun's rays 
WordNet® 3.0, © 2006 by Princeton University.
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