Among the instruments listed as required for IFR operations in the US FAR is are various "gyroscopic" instruments, including those for the turn coordinator, attitude and heading. In modern avionics, though, there are no gyros. All the inertial sensing is done through some sort of non-spinning resonator (see https://en.wikipedia.org/wiki/Vibrating_structure_gyroscope). How are these things "gyroscopes" within the language of the FAR? Am I misunderstanding what the term means? I thought the "gyro" root meant "to turn in a circle" (as in "gyrate" or the making of the Greek sandwich), which is how heading/attitude/rate-of-turn devices all used to work. Obviously this is a nitpick since the point is to sense rotation. But then why does the FAR specify "gyroscopic" as a modifier for the various instruments?
ETA: The origin of this question was a Sheppard Air test prep q referencing the FAR. Supposedly, all of these questions are on actual FAA exams. Here's another one, which in light of the comments I marked "B" for. But according to SA, the correct answer is "C". So (if SA is correct) the FAA seems to think here that a gyro is actually a spinning object.
(Also, thanks whoever downvoted this, while a People Magazine question about JFK Jr's IR training gets upvotes.)