kithara
noun
kith·a·ra ˈki-thə-rə 
variants or cithara
ˈsi-thə-rə ˈki-
ˈki- : an ancient Greek stringed instrument similar to but larger than the lyre and having a box-shaped resonator
Example Sentences
Recent Examples on the Web Equally impressive is an unbroken amphora on loan from the Metropolitan Museum of Art in New York that depicts a singing, swaying Citharode, a robed young man playing the stringed kithara. 
Steven Litt, cleveland.com, 23 July 2017
Steven Litt, cleveland.com, 23 July 2017 Word History
Etymology
Middle English cithara, from Latin, from Greek kithara
First Known Use
14th century, in the meaning defined above
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