navigable semicircle

American  

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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Example Sentences

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

From Project Gutenberg

They can usually rely upon "riding out" the "navigable semicircle" at anchor.

From Time Magazine Archive