IPA: /ˈkwɒdplɛks/
KK: /ˈkwɒdplɛks/
A type of building that is split into four individual living spaces or business areas.
The new quadplex on the corner has four apartments for rent.
Quadplex → It is formed from "quad" (from Latin "quattuor", meaning four) and "plex" (from Latin "plicare", meaning to fold). The word "quadplex" refers to something that is folded or arranged in four parts or units.
Think of 'four' ('quad') being 'folded' ('plex') together — that's why quadplex means something arranged in four parts.
No commonly confused words.