IPA: /ˌfɛrɪˈfɛrəs/
KK: /ˈfɛrɪfərəs/
Describing something that contains or produces iron.
The ferriferous rock was rich in iron deposits, making it valuable for mining.
Ferriferous → It is formed from "ferrum" (meaning iron) and "-ferous" (meaning bearing or producing). The word "ferriferous" means bearing or producing iron.
Think of 'iron' ('ferrum') being 'produced' or 'carried' ('-ferous') — that's why ferriferous refers to something that contains or produces iron.