diapason /dī-ə-pāˈzən, -sən/ (music)

1. A full volume of various sounds in concord
2. The whole range or compass of tones
3. A standard of pitch
4. A whole octave (obsolete)
5. A bass part (obsolete)
6. Harmony (obsolete)
7. A foundation-stop of an organ (open or stopped diapason) extending through its whole range

• under one's hat
• under one's nose
• under one's own steam
• under one's thumb
• under one's very nose
• underpaid
• under pain of
• underpainting
• underpaintings
• underpants
• underpart
• underparts
• underpass
• underpasses
• underpassion
• underpassions
• underpay
• underpaying
• underpayment
• underpayments
• underpays
• underpeep
• underpeeped
• underpeeping
• underpeeps