heliograph Hear it!

heliograph Definition

he·lio·graph (-graf′)

noun

  1. a permanent image formed on a glass plate by an early photographic process
  2. a device for sending messages or signaling by flashing the sun's rays from a mirror

Etymology: helio- + -graph

transitive verb, intransitive verb

to signal or communicate by heliograph

Related Forms:

heliograph Usage Examples

Modifies a noun

  • message: Low sent a heliograph message to Battye to retire to the bridgehead and keep his five companies together.