phenology

n. [ Contracted from Phenomenology. ] (Biol.) The science of the relations between climate and periodic biological phenomena, as the migrations and breeding of birds, the flowering and fruiting of plants, etc. -- Phe`no*log"ic*al a. -- Phe`no*log"ic*al*ly, adv. -- Phe*nol"o*gist n. [Webster 1913 Suppl.]