Wiktionary
fortississimo
adv. (context music English) The musical notation indicating that the piece is played louder than fortissimo. n. (context music English) The dynamic sign indicating that the piece should be played louder than fortissimo. Abbreviation: fff.
Usage examples of "fortississimo".
The archetypal ragbag of the deep unconscious: mental cacophony, nightmare broadcast fortississimo, wide-open emotional stops shrillingblaringhissing above bourdon thunder-bellow.