alula /alˈū-lə/

In birds, the bastard wing

• ballistas
• ballistic
• ballistic missile
• ballistic missiles
• ballistic pendulum
• ballistic pendulums
• ballistics
• ballistite
• ballistites
• ballistocardiogram
• ballistocardiograms
• ballistocardiograph
• ballistocardiography
• ballium
• balliums
• ball lightning
• ball mill
• ball mills
• ballocks
• ballocksed
• ballockses
• ballocksing
• ball of fire
• ballon
• ballon d'essai