ther·mo·pe·ri·od·ism 
(thûr′mō-pîrē-ə-dĭz′əm) also ther·mo·pe·ri·o·dic·i·ty (-dĭsĭ-tē)
(thûr′mō-pîrē-ə-dĭz′əm) also ther·mo·pe·ri·o·dic·i·ty (-dĭsĭ-tē)n.
The effect on an organism of the rhythmic fluctuation of temperature, including responses associated with thermal changes accompanying the alternation of day and night.