What does the word librettist mean?

Usage examples for librettist

  1. " I wish you had known him," he said; " he was the greatest librettist who ever existed. – In the Courts of Memory 1858-1875. by L. de Hegermann-Lindencrone
  2. He may or he may not be aware that Wagner was his own librettist, and quite possibly he supposes that it is the ordinary custom of the composers to write the words for their own music. – A Book About the Theater by Brander Matthews