The term 'HAIR PART' can be broken down into two words, 'HAIR' and 'PART'. The first word, 'HAIR', refers to the strands of protein filaments that grow from follicles found in the dermis. The second word, 'PART', refers to a division or section of something. When combined, the term 'HAIR PART' refers to a division or section of HAIR, such as a side PART, center PART, or zigzag PART. The crossword solution for this term is 'ROOT', which refers to the point at which the HAIR strand originates from the scalp.