Crossword Genius

Omega, in physics (3)

Ross

I believe the answer is:

ohm

'omega in physics' is the definition.
(I've seen this in another clue)

This is the entire clue.

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

I've seen this clue in The Washington Post, the L.A. Times Daily, the LA Times and the New York Times.
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