By Definition..

There is nothing called gold standard for the word 'definition'. one has to be precarious to define something.. If you define "water" as an entity in liquid state under STP of earth formed by the combination Heth 2 O... I say, the pronunciation of "H" in glass designing industry has been assigned for making markings on glass made articles using hydrogen fluoride.. if you don't say H2O but something else to name it, another one may catch another flaw in it. So never say by definition for anyhing.. as everything is the matter of change with time...