IPA: /ˌkrɪməˈnɒlədʒɪst/
KK: /ˌkrɪməˈnɑlədʒɪst/
A person who studies crime and criminal behavior, often to understand its causes and effects.
The criminologist presented her research on the impact of poverty on crime rates.
Criminologist → It is formed from "crimen" (from Latin, meaning crime) and "-ologist" (from Greek "-logia", meaning study of). A criminologist is someone who studies crime and its causes.
Think of someone who studies 'crime' ('crimen') — that's what a criminologist does.