suboctave /sub-okˈtiv/

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

• ultimate tensile stress
• ultima Thule
• ultimatum
• ultimatums
• ultimo
• ultimogeniture
• ultimogenitures
• ultimus haeres
• ultion
• ultions
• ulto.
• Ultonian
• ultra
• ultra-
• ultrabasic
• ultracentrifugal
• ultracentrifugation
• ultracentrifuge
• ultracentrifuged
• ultracentrifuges
• ultracentrifuging
• ultracrepidarian
• ultracrepidate
• ultracrepidated
• ultracrepidates