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Valid in these dictionaries

TWL/NWL (Scrabble US/CA/TH)
SOWPODS/CSW (Scrabble UK / ALL)
ENABLE (Words with Friends)

Meaning of tetrad

1 definition found

From WordNet (r) 3.0 (2006) [wn]:

  tetrad
      n 1: the cardinal number that is the sum of three and one [syn:
           {four}, {4}, {IV}, {tetrad}, {quatern}, {quaternion},
           {quaternary}, {quaternity}, {quartet}, {quadruplet},
           {foursome}, {Little Joe}]

Source : WordNet ® Princeton University. 2010.

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OCTWL / TWL : The official dictionary for scrabble game in United States, Canada and Thailand.
SOWPODS / CSW : UK and the rest of the world uses this dictionary for various word games including scrabble.
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