Crossword Genius

Piece de resistance? (3)

Ross

I believe the answer is:

ohm

'piece de resistance?' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for ohm that I've seen before include "A little resistance" , "Unit of electrical resistance (3)" , "measure of resistance" , "lawmaker" , "physical unit" .)

I've seen this clue in the New York Times and the Universal.
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