pianississimo
(ˌpɪənɪsˈɪsɪməʊ) musicadj (Classical Music) (of a piece of music) to be played even more quietly or softly than pianissimo; abbreviated as ppp
adv (Classical Music) even more quietly or softly than pianissimo; abbreviated as ppp
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014