zither UK /ˈzɪ.ðə/US /ˈzɪ.ðɚ/noun 2verb 2forms 3 noun2 •A musical instrument consisting of a flat sounding box with numerous strings placed on a horizontal surface, played with a plectrum or fingertips. •Related or similar instruments in other cultures, such as the Chinese guqin or Norwegian harpeleik; especially any chordophone without a neck, and with strings that pass over the body. verb2 •To play a zither.[…] the fluting began again. Not alone this time, but, to Rosalie’s infinite surprise, accompanied on a zither. […] At this moment the fluting and zithering began again. — 1892 •To make a sound similar to that made by a zither; to move while making such a sound.Now [the wind] swithered through the badly-fixed windows, making zithering sounds as of an army of cold and frozen-out mosquitoes […] — 1890 formszithered · zithering · zithers