coel- or coelo- (also N American cel- or celo-) /sēl- or sē-lō-/

Denoting a cavity, or hollow part

• ballat royal
• ballats
• ball-barrow
• ball-barrows
• ball-bearing
• ball-bearings
• ball-boy
• ball-boys
• ball-breaker
• ball-breakers
• ball-breaking
• ball-buster
• ball-busters
• ball-busting
• ball cartridge
• ballclay
• ballclays
• ballcock
• ballcocks
• ball-dress
• ball-dresses
• balled
• balled-up
• ballerina
• ballerinas