1. An imaginary being inhabiting the air; a fairy.
2. A slender, graceful woman.
3. (Science: ornithology) Any one of several species of very brilliant south American humming birds, having a very long and deeply-forked tail; as, the blue-tailed sylph (Cynanthus cyanurus).
Origin: F. Sylphe, m, fr. Gr. A kind of grub, beetle, or moth; so called by Paracelsus.