IPA: //ˌkoʊɪnˈvɛntər//
KK: /kɔɪˈɪnvəntər/
A person who works together with others to create or invent something.
Thomas Edison and Nikola Tesla were coinventors of several electrical devices.
Coinventor → It is formed from "co-" (meaning together) and "inventor" (from Latin "invenire", meaning to find or discover). The word "coinventor" refers to a person who discovers or creates something together with others.
Think of people 'together' ('co-') working to 'discover' ('inventor') something new.