IPA: /ˌsɛdɪˈmɛnˌtɒlədʒɪst/
KK: /ˌsɛdɪˈmɛnˌtɑlədʒɪst/
A person who studies sediment, which is material that settles at the bottom of a liquid, often in relation to geology and environmental science.
The sedimentologist collected samples from the riverbed to analyze the layers of sediment.
Sedimentologist → It is formed from "sediment" (from Latin "sedimentum", meaning settling or to settle) and "-ologist" (from Greek "-logia", meaning study of). A sedimentologist is someone who studies the materials that settle at the bottom of bodies of water.
Think of someone who studies the 'settling' materials ('sediment') at the bottom of water, and the '-ologist' means they are an expert in that study.