[phe.nol.o.gy] n [phenomena + -logy] (ca. 1884) 1: a branch of science dealing with the relations between climate and periodic biological phenomena (as bird migration or plant flowering)
2: periodic biological phenomena (as of a kind of organism) that are correlated with climatic conditions -- phe.no.log.i.cal adj -- phe.no.log.i.cal.ly adv