Definition of photoregulator in US English:

photoregulator

noun

Biology
  • A biological mechanism that regulates a process according to the duration, intensity, etc., of the light which it detects.

Origin

1950s. From photo- + regulator, after photoregulate.

Pronunciation

photoregulator

/ˌfəʊtəʊˈrɛɡjʊleɪtə/