Crossword Genius

Greek letter (3)

Ross

'greek letter' is the definition.
(letter from the Greek alphabet)

This is the entire clue.

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

I've seen this clue in The Washington Post, The Telegraph, the Penny Press, The Times, The Mirror, The Independent, the Evening Standard, The Star Tribune, the Sydney Morning Herald and the King Feature Syndicate.
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