Sentence:  He was seeing , somehow , the face of a young boy , the boy Simms Purdew must once have been , a boy with sorrel <WSD>hair</WSD> , and blue eyes dancing with gaiety , and the boy mouth grinning trustfully among the freckles . 
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