Found 2 items, similar to heliogram.
English → English (WordNet) Definition: heliogram heliogram n : a message transmitted by means of the sun's rays
English → English (gcide) Definition: Heliogram 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.]