IPA: /pəˈlɪkəˌtoʊmi/
KK: /pɑːlɪˈkɒtəmi/
A situation in which something is divided into more than two parts or categories.
The study of the species revealed a polychotomy in their evolutionary paths.
Polychotomy is formed from "poly-" (meaning many) and "chotomy" (from Greek "chotomia", meaning to cut). The word refers to the division into many parts or branches.
Think of 'many' ('poly-') divisions or 'cuts' ('chotomy') to remember that polychotomy means a division into many parts.