n. An instrument for experimenting upon the mathematical
relations of musical sounds. It consists of a single string stretched
between two bridges, one or both of which are movable, and which stand
upon a graduated rule for the purpose of readily changing and measuring
the length of the part of the string between them.
n. 单弦琴, 测弦器
[医] 单音听觉器, 舒尔策氏单音听觉器