Definition of photophonic in US English:

photophonic

adjective

historical
  • Relating to or produced by a photophone.

Origin

Late 19th century; earliest use found in Alexander Graham Bell (1847–1922), teacher of deaf people and inventor of the telephone. From photophone + -ic; compare -phonic.

Pronunciation

photophonic

/ˌfəʊtə(ʊ)ˈfɒnɪk/