IPA: //ˌproʊtəʊˈhɪstɪk//
KK: /proʊtəʊhɪstɪk/
Relating to the period of time before written records were kept, often used to describe cultures or societies that existed before historical documentation.
The archaeologists studied protohistoric artifacts to learn about the early inhabitants of the region.
Protohistoric → It is formed from "proto-" (from Greek "protos", meaning first) and "historic" (from Greek "historikos", meaning relating to history). The word refers to the period of human history that precedes written records, thus meaning the first stages of history before it was documented.
Think of 'proto-' meaning 'first' and 'historic' relating to 'history' — protohistoric refers to the earliest stages of history before it was written down.