IPA: /səˌlɛnəˈlɒdʒɪkəl/
KK: /səˈlɛnəˌlɒdʒɪkəl/
Relating to the study of the moon and its characteristics.
The selenological research provided new insights into the moon's surface composition.
Selenological → It is formed from "selene" (from Greek σελήνη, meaning moon) and "-logy" (from Greek -λογία, meaning study of). The word "selenological" refers to the study of the moon.
Think of 'selene' for moon and '-logy' for study — that's why selenological means the study of the moon.