Noun
clavicytherium (plural clavicytheriums or clavicytheria)
(music) A harpsichord in which the soundboard and strings are mounted vertically facing the player. [early 16th c.]
Dearling 1996, 138 In a clavicytherium, the jacks move horizontally without the assistance of gravity, so that clavicytherium actions are more complex than those of other harpsichords. Source: Internet