scotophil

noun

1. The phase of a two-phase circadian rhythm associated with dark and relaxation or regeneration.

   “Glucose caused some inhibition of flowering when applied for only the initial scotophil phase of darkness (0 to 9 hr), but there was no comparable effect of sucrose even though its equivalent molarity (0.6 M) represented a higher percentage concentration.”

   “Short-day effects were seen to result when light was restricted to the photophil, while long-day effects were produced when light encroached into scotophil (figure 1.2).”

   “Under short-day conditions the scotophil occurs entirely during the scotophase, and a short-day response (e.g., diapause) is induced.”