parasitology Syllabification: (par·a·si·tol·o·gy)Pronunciation: /ˌparəsiˈtäləjē, -sī-/Definition of parasitology noun the branch of biology or medicine concerned with the study of parasitic organisms. Derivatives parasitologicalPronunciation: /ˌparəˌsītlˈäjikəl, -ˌsitl-/ adjective parasitologistPronunciation: /-jist/ noun parasitology in other Oxford dictionaries Definition of parasitology in the British & World English dictionary