Beaufort scale noun phr. ['bǝʊfǝt skeɪl] M19.
[Sir Francis Beaufort (1774-1857), English admiral.]
A scale of whole numbers denoting ranges of wind speed, from 0 for 0-0.2 metres per second (calm) to 12 for over 32.6 metres per second (hurricane).

► The scale is sometimes extended to higher numbers.

[TahlilGaran] English Dictionary ▲