pi·a·nis·si·mo 
(pē′ə-nĭsə-mō′) Music
(pē′ə-nĭsə-mō′) Music adv. & adj. Abbr. pp
In a very soft or quiet tone. Used chiefly as a direction.
n. pl. pi·a·nis·si·mos
A part of a composition played very softly or quietly.
[Italian, superlative of piano, soft; see PIANO2.]
- radiophotography
- radioscopic
- radioscopical
- radioscopy
- radiosensitive
- radiosensitivity
- radiosonde
- radio spectrum
- radiosurgery
- radiotelegraph
- radiotelegraphic
- radiotelegraphy
- radiotelephone
- radiotelephonic
- radiotelephony
- radio telescope
- radiotherapist
- radiotherapy
- radiothermal
- radiotoxic
- radiotoxicity
- radiotracer
- radio wave
- radish
- Radisson