a range of numbers used for measuring how strongly the wind is blowing. The lowest number 0 means that there is no wind and the highest number 12 means that there is a hurricane (= a violent storm with very strong winds). The storm measured 10 on the Beaufort scale. See related entries: Wind Word Origin mid 19th cent.: named after Sir Francis Beaufort (1774–1857), the English admiral and naval hydrographer who devised it.