IPA: /prɪˈkɜːsər/
KK: /priˈkɜrsər/
A person or thing that comes before another and signals or suggests what is to follow.
The new technology was a precursor to the modern smartphone.
Precursor → It is formed from "pre-" (meaning before) and "currere" (meaning to run). The word refers to something that runs before or comes before something else, often indicating a forerunner or something that precedes another.
Think of something that 'runs before' ('pre-') another thing — that's why a precursor is something that comes before.