αὐτομαθής

ές, Adv.
A. having learnt of oneself, Ph. 1.35, al., Plu. 2.992a; τινός self-taught, of persons, in a thing, AP 6.218 (Alc.); of that which is learnt, ἐπιστήμη Ph. 1.164; spontaneous, συγγένειαν εἶναι μούσαις αὐτομαθῆ Phld. Po. 2.47. Adv. ‐θῶς Philostr. VS 1.15.2, Ph. 1.62.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project