D defs.my
Entry 1 sense Webster, 1913

Roaring forties

/rôr'-ĭng fôr'-tēz/ · Roar·ing for·ties · IPA
01 The middle latitudes of the southern hemisphere. So called from the boisterous and prevailing westerly winds, which are especially strong i…
  1. 1.
    The middle latitudes of the southern hemisphere. So called from the boisterous and prevailing westerly winds, which are especially strong in the South Indian Ocean up to 50° S.(Naut.)