phe·nol·o·gy 
(fĭ-nŏlə-jē)
(fĭ-nŏlə-jē)n.
1. The scientific study of periodic biological phenomena, such as flowering, breeding, and migration, in relation to climatic conditions.
2. The timing of a periodic biological phenomenon in relation to climatic conditions.
[PHENO(MENON) + -LOGY.]
phe′no·logi·cal (fē′nə-lŏjĭ-kəl) adj.
phe′no·logi·cal·ly adv.
phe·nolo·gist n.