suboctave /sub-okˈtiv/

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

• bilateralism
• bilateralisms
• bilaterally
• bilateral symmetry
• bilberries
• bilberry
• bilbies
• bilbo
• bilboes
• bilbos
• bilby
• Bildungsroman
• bile
• bile ducts
• biles
• bi-level
• bi-levels
• bilge
• bilged
• bilge keel
• bilge keels
• bilge-pump
• bilge-pumps
• bilges
• bilge-water