Sentence:  Over the rapidly diminishing outline of a jump seat piled high with luggage Herry 's black brushcut was just discernible , near , or enviably near that spot where - hidden - more delicately textured , most beautifully tinted <WSD>hair</WSD> must still be streaming back in cool , oh cool wind sweetly perfumed with sagebrush and yucca flowers and engine fumes . 
Meaning of the word marked with <WSD> tags:  a covering for the body (or parts of it) consisting of a dense growth of threadlike structures (as on the human head); helps to prevent heat loss