Source : Webster's Revised Unabridged Dictionary (1913)

Flaxen \Flax"en\, a.
   Made of flax; resembling flax or its fibers; of the color of
   flax; of a light soft straw color; fair and flowing, like
   flax or tow; as, flaxen thread; flaxen hair.

Source : WordNet®

flaxen
     adj : of hair color; pale yellowish to yellowish brown; "flaxen
           locks" [syn: {sandy}]