Crossword Genius

Rapid measuring system Zeno introduced, oddly abandoned (8)

Ross

I believe the answer is:

meteoric

'rapid' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for meteoric that I've seen before include "Like a small body in space" , "Erotic me being suddenly brilliant" , "Fast; brilliant" , "Brilliant, as a shooting star" , "(Of change) very rapid" .)

I've seen this clue in The Guardian.
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