sylph 
(sĭlf)
(sĭlf)n.
1. A slim, graceful woman or girl.
2. In the occult philosophy of Paracelsus, a being that has air as its element.
[New Latin sylpha, perhaps blend of Latin sylvestris, of the forest (from silva, sylva, forest) and Latin nympha, nymph; see NYMPH.]