northwest by west

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The direction or point on the mariner's compass halfway between northwest and west-northwest, or 56°15′ west of due north.
• adverb & adjective Toward or from northwest by west.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The compass point halfway between northwest and west-northwest, specifically 303.75°, abbreviated as NWbW.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the compass point that is one point west of northwest