arm‧band /ˈɑːmbænd $ ˈɑːrm-/ noun [countable]

1. a band of material that you wear around your arm to show that you have an official position, or as a sign of mourning

2. [usually plural] British English one of two bands of plastic filled with air that you wear around your arms when you are learning to swim Synonym : waterwings

[TahlilGaran] Dictionary of Contemporary English ▲