Noun
autoharp (plural autoharps)
A string instrument having a series of chord bars attached to dampers (muting bars) which mute all the strings other than those that form the desired chord.
The article began, "She goes barefooted when she feels like it, wears Levis to class because they're more comfortable, and carries her Autoharp with her everywhere she goes so that in case she gets the urge to break into song, it will be handy. Source: Internet