autodidact
/ˌɔːtəʊˈdɪdækt/noundefinition
A self-taught person; someone who has learned a subject without the benefit of a teacher or formal education.
etymology
From Greek autodidaktos, "self-taught" — autos ("self") joined to didaktos ("taught"), the verbal adjective of didaskein ("to teach"). It travelled into English via Latin autodidactus, arriving in the mid-1700s.
auto
“self”
Greek autos
+
didact
“taught”
Greek didaktos
autodidact
first attested: mid-18th century