n. The study of the effect of climate on periodic biological phenomena.
the GNU version of the Collaborative International Dictionary of English
n. 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.
The Century Dictionary and Cyclopedia
n. That branch of applied meteorology which treats of the influence of climate on the recurrence of the annual phenomena of animal and vegetable life.
Word Usage
"Hydrology, the research gathers together more than 25,000 long-term phenology trends for 726 species of plants and animals."