Noun
An instrument shaped like a lute, but strung with wire and played with a quill or plectrum.
Source: Webster's dictionaryIn the early 1970s English luthier Stefan Sobell developed a large-bodied, flat-backed mandolin with a carved soundboard, based on his own cittern design; this is often called a 'Celtic' mandolin. Source: Internet
A waldzither *The modern cittern may also be loosely included in an "extended" mandolin family. Source: Internet