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Definition of pH noun from the Oxford Advanced Learner's Dictionary

 

pH

 noun
noun
BrE BrE//ˌpiː ˈeɪtʃ//
 
; NAmE NAmE//ˌpiː ˈeɪtʃ//
 
[singular] (chemistry)
 
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a measurement of the level of acid or alkali in a solution or substance. In the pH range of 0 to 14 a reading of below 7 shows an acid and of above 7 shows an alkali. a pH of 7.5 to test the pH level of the soil Wordfinderacid, catalyst, chemistry, compound, formula, molecule, pH, react, solution, valency Word Origin early 20th cent.: from p representing German Potenz ‘power’ + H, the symbol for hydrogen.
See the Oxford Advanced American Dictionary entry: pH