Crossword Genius

Group of four (7)

Ross

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6

7

tetrad

'group of four' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for tetrad that I've seen before include "Group or set of four" , "number of Gospel writers" , "quartet" .)

I've seen this clue in the USA Today, the Universal, The Times, the New York Times, the Wall Street Journal, the Penny Press, The Guardian, the L.A. Times Daily and The Washington Post Sunday.
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