IPA: /ˌɔrnɪˈθɒlədʒɪkəl/
KK: /ɔrnɪˈθɑlədʒɪkəl/
Related to the study of birds.
The ornithological research conducted in the area revealed several new species of birds.
Ornithological → It is formed from "ornitho-" (from Greek "ornithon", meaning bird) and "-logical" (from Greek "logia", meaning study or discourse). The word "ornithological" refers to the study or discourse about birds.
Think of 'ornitho-' meaning birds and '-logical' meaning study. This helps you remember that ornithological relates to the study of birds.