Definition of phototonic in English:

phototonic

adjective

Botany
rare
  • Relating to, of the nature of, or exhibiting phototonus.

Origin

Late 19th century; earliest use found in Alfred Bennett (1833–1902), botanist and publisher. From photo- + tonic, after phototonus.

Pronunciation

phototonic

/ˌfəʊtəʊˈtɒnɪk/