helicon /helˈi-kon or -kən/

A circular bass tuba

• boosterisms
• boosters
• booster seat
• booster seats
• boosting
• boosts
• boot
• bootable
• boot and saddle
• bootblack
• bootblacks
• boot boy
• boot camp
• boot camps
• boot-catcher
• boot-catchers
• bootcut
• booted
• bootee
• bootees
• boot-faced
• booth
• boot-hook
• boot-hooks
• boothose