Probably derived from commentary on Homer, Odyssey 13.332, where the headword occurs (web address 1). For apparently related words see epsilon 2216, epsilon 2219. Adler reports that ms V reads (homophonous) e)ph/tus for the headword.
[1] This word (which can also mean erudite, learned; and cf. under lambda 643) is used, among others, to gloss the term in Hesychius epsilon4603, the Ambrosian Lexicon (1349), and the scholia to Homer (above).
[2] This word is used to gloss the term at Etymologicum Magnum 356.46; Ambrosian Lexicon 1371.