n. Dental floss.n. Short or waste silk fibers, especially from the outer surface of the cocoon of a silkworm.n. Soft, loosely twisted thread, as of silk or cotton, used in embroidery.n. A downy or silky fibrous substance, such as corn silk or silk cotton.v. To clean between (teeth) with dental floss.verb-intransitive. To use dental floss.