IPA: //ˌmʌltiˈɛlɛkˌtroʊd//
KK: /mʌltiˈɛlɛkˌtroʊd/
Relating to or involving multiple electrodes.
The multielectrode array was used to measure brain activity.
Multielectrode → It is formed from "multi-" (from Latin "multus", meaning many) and "electrode" (from "electro-" derived from Greek "ēlektron", meaning amber, which is associated with electricity, and "-ode" from Greek "hodos", meaning way or path). The word "multielectrode" refers to a device that has many paths for electrical conduction.
Think of 'many' ('multi-') paths for electricity ('electrode') — that's what multielectrode means.
No commonly confused words.