Crossword Genius

Pressure measure (3)

Ross

I believe the answer is:

'pressure measure' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for psi that I've seen before include "Pounds per square inch (abbr.); Greek letter" , "one employed by Socrates?" , "letter from abroad" , "Pounds per sq. in. (abbr.)" , "Greek character" .)

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