pho·to·pe·ri·od·ism (fō
tō-pîr
ē-ə-dĭz
əm) also
pho·to·pe·ri·o·dic·i·ty (-dĭs
ĭ-tē)
n. pl. pho·to·pe·ri·od·isms, also
pho·to·pe·ri·o·dic·i·tiesThe response of an organism to changes in its photoperiod, especially as indicated by vital processes.
[TahlilGaran] American Dictionary ▲