autoharp n.

word-forming element meaning "self, one's own, by oneself, of oneself" (and especially, from 1895, "automobile"), from Greek autos, reflexive pronoun, "self, same," which is of unknown origin. It also was a common word-forming element in ancient Greek, as in modern English, but very few of the old words have survived the interval. In Greek, as a word-forming element, auto- had the sense of "self, one's own, of oneself ('independently'); of itself ('natural, native, not made'); just exactly; together with." Before a vowel, it became aut-; before an aspirate, auth-. In Greek it also was used as a prefix to proper names, as in automelinna "Melinna herself." The opposite prefix would be allo-.

Old English hearpe "harp, stringed musical instrument played with the fingers," from Proto-Germanic *harpon- (source also of Old Saxon harpa "instrument of torture;" Old Norse harpa, Dutch harp, Old High German harpfa, German Harfe "harp") of uncertain origin. Late Latin harpa, source of words in some Romanic languages (Italian arpa, Spanish arpa, French harpe), is a borrowing from Germanic. Meaning "harmonica" is from 1887, short for mouth-harp. The harp seal (1784) is so called for the harp-shaped markings on its back.