IPA: /ˌɒlɪɡəˈfeɪɡəs/
KK: /ˌɑlɪɡəˈfegəs/
Describing an organism that feeds on a limited variety of food sources, particularly a small number of plants, often used in reference to insects.
Some insects are oligophagous, meaning they only eat a few types of plants.
Oligophagous → It is formed from "oligo-" (from Greek "oligos", meaning few or little) and "phagous" (from Greek "phagein", meaning to eat). The word describes organisms that eat only a few types of food.
Think of 'few' ('oligo-') types of food that an organism 'eats' ('phagous') — that's what oligophagous means.