We don't have synonyms for cittern yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are cistern, cithern and bittern.
(n) :
A stringed instrument (chordophone), played with a plectrum (a pick), and most commonly possessing four wire strings and chromatic frets, which is a precursor to the modern day guitar.
(n) :
A stringed instrument (chordophone), played with a plectrum (a pick), and most commonly possessing four wire strings and chromatic frets, which is a precursor to the modern day guitar.