Definition of scotophobin in English:

scotophobin

Pronunciation /skəʊtə(ʊ)ˈfəʊbɪn/

noun

historical Biochemistry
  • An oligopeptide obtained from the brains of rats which had been trained to avoid darkness, formerly claimed to induce dark avoidance in untrained rats and possibly animals of other species.

Origin

1970s. From scotophobia + -in.