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1.
hair that has not been dyed, bleached, permed, straightened i.e. it's hair that has not been chemically treated one way or another
it's so hard to find virgin hair nowadays
by JC February 01, 2004
 
2.
roots that show up 2 weeks after your last hair dye job
I need to go to the beauty parlor and touch up my virgin hair.
by Christie Daniels May 10, 2006