Is “Heliograph” a Scrabble word?
Yes
HELIOGRAPH
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Heliograph
noun
1.An apparatus for signalling by means of a moveable mirror which reflects flashes of sunlight.
2.A heliogram.
3.An instrument for measuring the intensity of sunlight.
verb
1.To send a message by heliograph.
2.To send a heliograph.
3.To photograph by sunlight.