fortississimo means indicating that the piece is to be played more loudly than fortissimo. Lexicurio rates it Sui generis — a strength score of 89 out of 100.
Etymology
Pseudo-Italianism, derived from fortissimo with an additional -iss-, instead of the expected Italian fortissimissimo.
adv
- Indicating that the piece is to be played more loudly than fortissimo.
noun
- The dynamic sign indicating that the piece should be played more loudly than fortissimo.