definition floss
floss (plural flosses) 1  a thread, used to clean the area between the teeth. ( 2 raw) silk fibres. 3  the fibres covering a corn cob.  Any thread-like material having parallel strands that are not spun or wound around each 1  other. (Britain) Spun sugar or cotton candy, especially in the phrase candy floss.  A body feather of an ostrich.