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navigable semicircle

noun, Nautical
1.
the less violent half of a cyclone; the half blowing in the direction opposite to that in which the cyclone is moving and in which a vessel can run before the wind.
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for navigable semicircle
Historical Examples
  • The ship a has the wind at east-northeast; she is to the left of the storm track, or technically in the navigable semicircle.

    Meteorology Charles Fitzhugh Talman
  • Left or navigable semicircle,—Steam and sailing vessels: Bring the wind on the starboard quarter, note the course and hold it.

    Wind and Weather Alexander McAdie

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