1. Elastic bands or bracelets worn on the wrist, typically made of silicone or rubber, marketed as providing health or performance benefits.
Usage: informal; often plural; popular in fitness and wellness contexts
2. Colored rubber or elastic bands used in orthodontics to hold archwires to brackets on teeth.
Usage: dental terminology; often plural

Examples

• She wore a powerband on her wrist during her workout.
• The orthodontist replaced the powerbands on his braces with new ones.
• Many athletes wear powerbands believing they improve balance and strength.
• The dental assistant carefully applied the powerbands to secure the wire.
• Powerbands come in various colors that can be changed at each appointment.