Definition of photoregulation in US English:

photoregulation

noun

Biology
  • The regulation of a biological or chemical process by means of the intensity, duration, etc., of light.

Origin

1960s; earliest use found in Science. From photo- + regulation [adjective], after photoregulate.

Pronunciation

photoregulation

/ˌfəʊtə(ʊ)ˌrɛɡjʊˈleɪʃn/