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 Star Tribune, the Evening Standard, the Sydney Morning Herald, The Independent, The Washington Post, the Penny Press, The Mirror, The Times and The Telegraph.
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