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ther·mo·pe·ri·od·ism(thûr′mō-pîr′ē-ə-dĭz′əm) also ther·mo·pe·ri·o·dic·i·ty (-dĭs′ĭ-tē)
The effect on an organism of the rhythmic fluctuation of temperature, including responses associated with thermal changes accompanying the alternation of day and night.
the effect on the growth and reproduction of plants or animals of timed exposures to varied temperatures. — thermoperiod, n. — thermoperiodic, adj.See also: Biology