stethoscope

Borrowed from French stéthoscope, a word coined by the physician René Laennec himself. He built it from the elements stetho- and -scope.

The facts given don't describe any shift in meaning — the word has named this listening instrument since Laennec coined it.

Its second half, -scope, links it to a family of English instrument names built the same way, though no specific cognate is given in the facts.