lithophonen.
/ˈlɪθəfəʊn/ Surgery.
An instrument for rendering audible the contact of a sound or probe with a vesical calculus.
ΚΠ
1889 in New Sydenham Soc. Lexicon
This entry has not yet been fully updated (first published 1903; most recently modified version published online June 2018).
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n.1889