'Heliogram' definitions:

Definition of 'heliogram'

(from WordNet)
noun
A message transmitted by means of the sun's rays

Definition of 'Heliogram'

From: GCIDE
  • 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.]