noun : a head of hair
No one says "Zowie! What a chevelure on that kid!" But that shouldn't stop you from emitting such an exclamation upon seeing a child with an arresting head of hair.
Chevelure has been used in English since the 15th century, when it was borrowed from the French who'd had the word since the days of Old French centuries before, but in the form chevelëure. Chevelëure, in turn, had its genesis in the Late Latin capillatura, from Latin capillatus, meaning "having long hair." These Latin words may remind you of capillary, and with good reason: the name of that smallest kind of blood vessel also comes ultimately from capillus, meaning "hair."
Disheveled is also a relation of chevelure, which we think lends some potency to other underused utterances along the lines of "That ride in the cabriolet was invigorating, but it left my chevelure sorely disheveled." (We are only trying to help.)