chronobiology Syllabification: (chron·o·bi·ol·o·gy)Pronunciation: /ˌkränōˌbīˈäləjē, ˌkrō-/Definition of chronobiology noun the branch of biology concerned with natural physiological rhythms and other cyclical phenomena. Derivatives chronobiologistPronunciation: /-ˌbīˈäləjist/ noun chronobiology in other Oxford dictionaries Definition of chronobiology in the British & World English dictionary