heliogram

from WordNet (r) 3.0 (2006)
heliogram
    n 1: a message transmitted by means of the sun's rays
from The Collaborative International Dictionary of English v.0.48
Heliogram \He"li*o*gram\ (h[=e]"l[i^]*[-o]*gr[.a]m), n. [Helio-
   + -gram.]
   A message transmitted by a heliograph.
   [Webster 1913 Suppl.]
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