suboctave /sub-okˈtiv/

1. The octave below
2. (also suboctave coupler) an organ coupler that gives an octave below

• fidibuses
• Fido
• fi donc
• fi donc!
• fids
• fiducial
• fiducially
• fiduciaries
• fiduciary
• fiduciary issue
• fidus Achates
• fidus et audax
• fie
• fief
• fiefdom
• fiefdoms
• fiefs
• field
• field allowance
• field ambulance
• field ambulances
• field artilleries
• field artillery
• field batteries
• field battery