west by north

the direction, or the point on a mariner's compass, halfway between due west and west-northwest; 11°15′ north of due west

See west by north in American Heritage Dictionary 4

noun Abbr. WbN

The direction or point on the mariner's compass halfway between due west and west-northwest, or 78°45: west of due north.

adverb & adj.

Toward or from west by north.

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