Crossword Genius

Group of four (6)

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 Washington Post Sunday, the Penny Press, the Universal, the New York Times, the USA Today, The Guardian, the L.A. Times Daily, The Times and the Wall Street Journal.
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