Het woord-zelf.
The ‘pronunciation’ is the actual living form or forms of a word, that is, the word itself, of which the current spelling is only a symbolization - generally, indeed, only the traditionally-preserved symbolization of an earlier form, sometimes imperfect to begin wtih, still oftener corrupted in its passage to our time. This living form is the latest fact in the form-history of the word, the starting-point of all investigations into its previous history, the only fact in its form-history to which the lexicographer can personally witness. For all his statements as to its previous history are only reproductions of the evidence of former witnesses, or deductions drawn from earlier modes of symbolizing the forms of the word then current, checked and regulated by the ascertained laws and principles of phonology. To register the current ‘pronunciation’ is therefore essential, in a dictionary which deals with the language on historical principles.
Murray's Dictionary, General Explanations, XIV.