ˌthərmōˈpirēəˌdizəm noun
also ther·mo·pe·ri·o·dic·i·ty -ˌpirēəˈdisəd.ē
Etymology: thermoperiodism from thermoperiod + -ism; thermoperiodicity from thermoperiodic + -ity
: the sum of the responses of an organism to appropriately fluctuating temperatures — compare photoperiodism