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1 wordie lists
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(n): (from potential of Hydrogen) the logarithm of the reciprocal of hydrogen-ion concentration in gram atoms per liter; provides a measure on a scale from 0 to 14 of the acidity or alkalinity of a solution (where 7 is neutral and greater than 7 is more basic and less than 7 is more acidic);
(n): the number of moles of hydrogen ions per cubic decimeter
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On the SOWPODS list of words allowed in Scrabble, but as an abbreviation pronounced as letters, it should not be allowed.