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 50ยก S.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). roaring forties. Retrieved September 21, 2026, from http://smartdefine.org/roaring_forties/definitions/2056274 |
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| MLA | Webster's. "roaring forties" 28 May 2011. Web. 21 September 2026. <http://smartdefine.org/roaring_forties/definitions/2056274> |